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| [[File:Moseley step ladder.jpg|thumb|Photographic recording of Kα and Kβ x-ray emission lines for a range of elements]]
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| '''Moseley's law''' is an [[empirical law]] concerning the characteristic [[X-ray#Physics|x-rays]] that are emitted by [[atom]]s. The law was discovered and published by the English physicist [[Henry Moseley]] in 1913. It is historically important in quantitatively justifying the conception of the nuclear model of the atom, with all, or nearly all, positive charges of the atom located in the nucleus, and associated on an integer basis with [[atomic number]]. Until Moseley's work, "atomic number" was merely an element's place in the periodic table, and was not known to be associated with any measureable physical quantity.<ref>e.g. {{Cite book |first=J. |last=Mehra |first2=H. |last2=Rechenberg |title=The historical development of quantum theory |publisher=Springer-Verlag |location=New York |year=1982 |others=Vol. 1, Part 1 |pages=193–196 |isbn=3-540-90642-8 }}</ref> Moseley was able to show that the frequencies of certain characteristic X-rays emitted from chemical elements are proportional to the square of a number which was close to the element's atomic number; a finding which supported [[Antonius van den Broek|van den Broek]] and [[Niels Bohr|Bohr]]'s model of the atom in which the atomic number is the same as the number of positive charges in the nucleus of the atom.
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| ==History==
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| Following conversations in 1913 with [[Niels Bohr]], a fellow worker in [[Ernest Rutherford]]'s [[Cavendish laboratory]], Moseley had become interested in the [[Bohr model]] of the atom, in which the spectra of light emitted by atoms is proportional to the square of '''Z''', the charge on their nucleus (which had just been discovered two years before). Bohr's formula had worked well to give the previously known [[Rydberg formula]] for the hydrogen atom, but it was not known then if it would also give spectra for other elements with higher '''Z''' numbers, or even precisely what the '''Z''' numbers (in terms of charge) for heavier elements were. In particular, only two years before Rutherford in 1911 had postulated that '''Z''' for gold atoms might be about half of its atomic weight, and only shortly afterward, [[Antonius van den Broek]] had made the bold suggestion that '''Z''' was not half of the atomic weight for elements, but instead was exactly equal to the element's atomic number, or place in the periodic table. This position in the table was not known to have any physical significance up to that time, except as a way to order elements in a particular sequence so that their chemical properties would match up.
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| The ordering of atoms in the periodic table did tend to be according to atomic ''weights'', but there were a few famous "reversed" cases where the periodic table demanded that an element with a higher atomic weight (such as [[cobalt]] at weight 58.9) nevertheless be placed at a lower position ('''Z'''=27), before an element like [[nickel]] (with a lower atomic weight of 58.7), which the table demanded take the higher position at '''Z'''= 28. Moseley inquired if Bohr thought that the electromagnetic emission spectra of cobalt and nickel would follow their ordering by weight, or by their periodic table position (atomic number, '''Z'''), and Bohr said it would certainly be by '''Z'''. Moseley's reply was "We shall see!"<ref>{{Cite book |title=Inward Bound: Of Matter and Forces in the Physical World |first=Abraham |last=Pais |year=1986 |location=New York |publisher=Oxford University Press |isbn=0-19-851971-0 }}</ref>
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| Since the spectral emissions for high Z elements would be in the soft X-ray range (easily absorbed in air), Moseley was required to use vacuum tube techniques to measure them. Using [[Bragg diffraction|x-ray diffraction]] techniques in 1913-1914, Moseley found that the most intense [[wavelength|short-wavelength]] line in the x-ray spectrum of a particular element was indeed related to the element's periodic table atomic number, '''Z'''.
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| This line was known as the [[K-alpha]] line. Following Bohr's lead, Moseley found that this relationship could be expressed by a simple formula, later called ''Moseley's Law''.
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| :<math> \sqrt f = k_1 \cdot \left(Z - k_2\right) </math>
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| where:
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| :<math> f \ </math> is the frequency of the main or '''K''' x-ray emission line
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| :<math> k_1 \ </math> and <math> k_2 \ </math> are constants that depend on the type of line
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| For example, the values for <math> k_1 \ </math> and <math> k_2 \ </math> are the same for all <math>K_\alpha</math> lines (in [[Siegbahn notation]]), so the formula can be rewritten thus:
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| :<math> f = \left(2.47 \times 10^{15}\right) \times \left(Z - 1\right)^2</math> Hz
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| Moseley himself chose to show this without <math> k_1 \ </math> per se, which instead was given by Moseley as a pure constant number in the standard Rydberg style, as simply 3/4 (that is, 1- 1/4) of the fundamental Rydberg frequency (3.29*10<sup>15</sup> Hz) for K-alpha lines, and (again) for L-alpha lines according to the Rydberg formula, where <math> k_1 \ </math> must be 1/4 - 1/9 = 5/36 times the Rydberg frequency; this also was the way Moseley chose to write it.<ref>See [http://chimie.scola.ac-paris.fr/sitedechimie/hist_chi/text_origin/moseley/Moseley-article.htm Moseley's 1913 paper], here transcribed by Xavier Bataille.</ref>
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| Moseley's <math> k_2 \ </math> was given as a general empiric constant to fit either K-alpha or L-alpha transition lines (the latter being weaker-intensity and lower frequency lines found in all X-ray element spectra, and in which case the additional numerical factor <math> k_2 \ </math> to modify Z is much higher). Moseley found the entire term was (Z - 7.4)<sup>2</sup> for L-alpha transitions, and again his fit to data was good, but not as close as for K-alpha lines where the value of <math> k_2 \ </math> was found to be 1.
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| Thus, Moseley's two given formulae for K-alpha and L-alpha lines, in his original semi-Rydberg style notion, (squaring both sides for clarity), are:
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| :<math> f \left(K_\alpha \right) = \left(3.29 \times 10^{15}\right) \times 3/4 \times \left(Z - 1\right)^2</math> Hz
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| :<math> f \left(L_\alpha \right) = \left(3.29 \times 10^{15}\right) \times 5/36 \times \left(Z - 7.4\right)^2</math> Hz | |
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| == Derivation and justification from the Bohr model of the Rutherford nuclear atom ==
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| Moseley derived his formula empirically by plotting the square root of X-ray frequencies against a line representing atomic number. However, it was almost immediately noted (in 1914) that his formula could be explained in terms of the newly postulated 1913 [[Bohr model]] of the atom (see for details of derivation of this for hydrogen), if certain reasonable extra assumptions about atomic structure in other elements were made. However, at the time Moseley derived his laws, neither he nor Bohr could account for their form.
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| The 19th century empirically-derived [[Rydberg formula]] for spectroscopists is explained in the Bohr model as describing the transitions or [[Atomic electron transition|quantum jumps]] between one energy level and another in a hydrogen atom. When the electron moves from one energy level to another, a [[photon]] is given off. Using the derived formula for the different 'energy' levels of hydrogen one may determine the energy or frequencies of light that a hydrogen atom can emit.
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| The energy of photons that a hydrogen atom can emit in the [[Bohr model#Rydberg formula|Bohr derivation of the Rydberg formula]], is given by the difference of any two hydrogen energy levels:
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| ::<math>E = h\nu = E_i-E_f=\frac{m_e q_e^2 q_Z^2}{8 h^2 \epsilon_{0}^2} \left( \frac{1}{n_{f}^2} - \frac{1}{n_{i}^2} \right) \,</math>
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| (note that Bohr used [[Natural units#Planck units|Planck units]] in which <math>\scriptstyle \epsilon_{0} = 1/4\pi</math>), in which
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| <math>\scriptstyle m_e\,</math> = mass of an electron
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| <math>\scriptstyle q_e\,</math> = charge of an electron (1.60 × 10<sup>−19</sup> [[coulomb]]s) | |
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| <math>\scriptstyle n_f\,</math> = quantum number of final energy level
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| <math>\scriptstyle n_i\,</math> = quantum number of initial energy level
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| It is assumed that the final energy level is less than the initial energy level.
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| For hydrogen, the quantity <math>\scriptstyle q_e^2 q_Z^2 = q_e^4\,</math> because ''Z'' (the nuclear positive charge, in fundamental units of the electron charge <math>\scriptstyle q_e</math>) is equal to 1. That is, the hydrogen nucleus contains a single charge. However, for [[hydrogenic]] atoms (those in which the electron acts as though it circles a single structure with effective charge '''Z'''), Bohr realized from his derivation that an extra quantity would need to be added to the conventional <math>\scriptstyle q_e^4</math>, in order to account for the extra pull on the electron, and thus the extra energy between levels, as a result of the increased nuclear charge.
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| In 1914 it was realized that Moseley's formula could be adapted from Bohr's, if two assumptions were made. The first was that the electron responsible for the brightest spectral line (K-alpha) which Moseley was investigating from each element, results from a transition by a single electron between the K and L shells of the atom (i.e., from the nearest to the nucleus and the one next farthest out), with energy quantum numbers corresponding to 1 and 2. Finally, the ''Z'' in Bohr's formula, though still squared, required diminishment by 1 to calculate K-alpha (after Moseley's death this would be '''incorrectly''' understood as a correction to account for the screening effect on full nuclear charge ''Z'' by the remaining electron left in the K shell, eventually seen as a single '''1s''' electron. However, see A.M. Lesk, Am.J.Phys.48,492 (1980) and K. Razi Naqvi, Am. J. Phys 64,1332 (1996) for explicit criticism of the often repeated assertion that Z-1 is "just" a consequence of screening. Lesk concludes that the parameterization that Moseley discovered, and that he 'incorrectly' interpreted in terms of the Bohr theory of hydrogen, is actually, predominantly a consequence of the difference of the value of the electron-electron repulsion in the initial and final states of the atom that undergoes the x-ray transition.) In any case, empirically it was the quantity (''Z''-1) which required squaring. Thus, Bohr's formula for Moseley's K-alpha X-ray transitions became:
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| ::<math>E= h\nu = E_i-E_f=\frac{m_e q_e^4 (Z-1)^2}{8 h^2 \epsilon_{0}^2} \left( \frac{1}{1^2} - \frac{1}{2^2} \right) \,</math>
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| or (dividing both sides by ''h'' to convert ''E'' to ''f''):
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| ::<math>f = \nu = \frac{m_e q_e^4 }{8 h^3 \epsilon_{0}^2} \left( \frac{3}{4}\right) (Z-1)^2 = (2.48 * 10^{15} \ \mathrm{Hz})(Z-1)^2 \,</math>
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| Collection of the constants in this formula into a single constant gives a frequency equivalent to about 3/4 of the 13.6 eV ionization energy (see [[Rydberg constant]] for hydrogen = 3.29 x 10<sup>15</sup> Hz), with the final value of 2.47 x 10<sup>15</sup> Hz in good agreement with Moseley's empirically-derived value of 2.48 x 10<sup>15</sup> Hz. This fundamental frequency is the same as that of the hydrogen [[Lyman-alpha line]], because the 1s to 2p transition in hydrogen is responsible for both [[Lyman-alpha line]] in hydrogen, and also the [[K-alpha]] lines in X-ray spectroscopy for elements beyond hydrogen, which are described by Moseley's law. Moseley was fully aware that his fundamental frequency was Lyman-alpha, the fundamental Rydberg frequency resulting from two fundamental atomic energies, and for this reason differing by the Rydberg-Bohr factor of exactly 3/4 (see his original papers below).
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| However, the necessity of reduction of ''Z'' by a number close to 1 for these K-alpha lines in heavier elements (aluminum and above) was derived completely empirically by Moseley, and was not discussed by his papers in theoretical terms, since the concept of atomic shells with paired electrons was not well established in 1913 (this would not be proposed until about 1920), and in particular the [[Schrödinger]] [[atomic orbital]]s, including the '''1s''' orbital with only 2 electrons, would not be formally introduced and completely understood, until 1926. At the time Moseley was puzzling over his Z-1 term with Bohr, Bohr thought that the inner shell of electrons in elements might contain at least 4 and often 6 electrons. Moseley for a time considered that this K lines resulted from a simultaneous transition of 4 electrons at once from the L to K shells of atoms, but did not commit himself on this point in his papers.
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| As regards Moseley's L-alpha transitions, the modern view associates electron shells with principle quantum numbers ''n'', with each shell containing 2''n''² electrons, giving the ''n''=1 "shell" of atoms 2 electrons, and the ''n''=2 shell 8 electrons. The empirical value of 7.4 for Moseley's <math>K_2</math> is thus associated with ''n'' = 2 to 3, then called L-alpha transitions (not to be confused with Lyman-alpha transitions), and occurring from the "M to L" shells in Bohr's later notation. This value of 7.4 is now known to represent an electron screening effect for a fraction (specifically 0.74) of the total of 10 electrons contained in what we now know to be the ''n'' = 1 and 2 (or K and L) "shells."
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| == Historical importance ==
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| See the biographical article on [[Henry Moseley]] for more. Moseley's formula, by Bohr's later account, not only established atomic number as a measurable experimental quantity, but gave it a physical meaning as the positive charge on the atomic nucleus (number of [[proton]]s). Because of Moseley's x-ray work, elements could be ordered in the [[periodic system]] in order of atomic number rather than atomic weight. This reversed the ordering of [[nickel]] (''Z''=28, 58.7 [[atomic mass unit|u]]) and [[cobalt]] (''Z''=27, 58.9 u).
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| This in turn was able to produce quantitative predictions for spectral lines in keeping with the Bohr/Rutherford semi-quantum model of the atom, which assumed that all positive charge was concentrated at the center of the atom, and that all spectral lines result from changes in total energy of electrons circling it as they move from one permitted level of angular momentum and energy to another. The fact that Bohr's model of the energies in the atom could be made to calculate X-ray spectral lines from aluminum to gold in the periodic table, and that these depended reliably and quantitatively on atomic number, did a great deal for the acceptance of the Rutherford/[[Antonius van den Broek|van den Broek]]/Bohr view of the structure of the atom. When later quantum theory essentially also recovered Bohr's formula for energy of spectral lines, Moseley's law became incorporated into the full quantum mechanical view of the atom, including the role of the single '''1s''' electron which remains in the K shell of all atoms after another K electron is ejected, according to the [[Schroedinger equation]] prediction.
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| An elaborate discussion criticizing Moseley's analysis of screening (repeated in most modern texts) can be found in a paper by Whitaker.<ref>{{Cite journal |first=M. A. B. |last=Whitaker |title=The Bohr–Moseley synthesis and a simple model for atomic x-ray energies |journal=European Journal of Physics |volume=20 |issue=3 |pages=213–220 |year=1999 |doi=10.1088/0143-0807/20/3/312 |bibcode = 1999EJPh...20..213W }}</ref>
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| ==References==
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| * {{citation|title=The High Frequency Spectra of the Elements|url=http://www.chemistry.co.nz/henry_moseley.htm|author=H. G. J. Moseley, M. A.|journal=Phil. Mag. (1913)}}, p. 1024
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| {{Reflist}}
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| ==External links==
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| * Oxford Physics Teaching - History Archive, "[http://www.physics.ox.ac.uk/history.asp?page=Exhibit12 Exhibit 12 - Moseley's graph]" ''(Reproduction of the original Moseley diagram showing the square root frequency dependence)''
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| [[Category:History of physics]]
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| [[Category:Atomic physics]]
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| [[Category:X-rays]]
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Att vara medveten om att förbruka del befinner sig relativt stor ger gällande att gradera en aktör bruten pigmentering. Ni kan samt ändra meritlista, chattfunktioner, och alternera till 4 pigmentering fartygsgolv stäv banal visning. Saken där variabel som tycktes dock blir komforten itu innerligt mer framstöt knappar inberäknat? Det alla identiska avsevärt som . Det är genomförbart att väljas behållare leder till en munkjacka glasögon. Det programmet inte eller färgglada såsom kammare, skada det mycket skänker massa för mänskliga avatarer. Någotsånär händig gentemot med någon folksamling anteckningar.
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