Magnetic circular dichroism of the ¹S→¹P transition of Mg atoms in noble gas matrices

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Schnepp

, , ().

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and

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, , ().

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and

J. L.

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, , ().

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, and

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and

M. A.

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, Jr. and

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, Jr.,

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, Jr., and

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, Jr., , ().

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, and

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, , ().

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, , ().

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,

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, and

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, , ().

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and

G. C.

 

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,  , ();

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, and

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, , ().

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,Jr. and

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,  , ();

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,

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, and

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,  , ()

[

A. A.

Belyaeva

,

Yu. B.

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, and

L. D.

Shcherba

, , ()].

S. L.

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and

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, , ().

I. N.

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,

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, and

A. J.

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, , ().

In our discussion of the MCD spectra, there will be frequent reference to the Faraday 𝒶, ℬ, and 𝒸 terms and to the dipole strength 𝒟. We use these symbols without subscript in a generic sense to describe dispersion forms and append subscripts to designate explicit mathematical expressions. The first three terms (the Faraday parameters) together define the MCD and arise, on application of a longitudinal magnetic field, from, respectively, the Zeeman shift, field‐induced mixing, and population differentials induced among ground state Zeeman sublevels. We follow the new conventions outlined by Stephens (Ref. 21, especially Appendix II). The specific parameters of interest are $a1,$ $B0,$ $C0,$ and $D0,$ which are related to our previous parameters (Ref. 22) as follows: $D0 = D/3,$ $a1 = 2A/3β,$ $B0 = −2B/3β,$ $e0 = −2C/3β.$ $a1,$ is associated with a first derivative MCD line shape and is defined to be positive (negative) if the line shape goes first negative (positive) and then positive (negative) going to higher energy. $B0$ and $e0$ are associated with absorptionlike line shapes and are defined as positive (negative) if their accompanying MCD is positive (negative). The MCD associated with $e0$ varies inversely with absolute temperature. $D0$ is proportional to the (zero‐field) absorption band area $∫(ε/ν)dν.$The specific definitions and physical significance of these parameters have been discussed elsewhere.²¹

P. J. Stephens, Advances in Chemical Physics, edited by I. Prigogine and Stuart A. Rice (Wiley, New York, 1976), Vol. 35, p. 197.

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