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- W2034002283 abstract "The pressure shift and the temperature coefficient of the pressure shift have been calculated for hyperfine spectra when radiating alkali atoms are perturbed by foreign gases. The method of calculation is based on a suggestion by H. Margenau. Both the pressure shift and the temperature coefficient can be calculated on the basis of potential functions representing intermolecular forces operative when the radiating atom is in the presence of the perturbing atoms. The noble gas atoms have been considered explicitly as perturbing atoms.For weak interactions (small perturbing atoms) a Lennard-Jones (6-12) potential is adequate to give excellent agreement between theory and experiment. Helium and neon give rise to weak interactions and the frequency shifts are toward the blue. When the interactions are strong (large perturbing atoms), a simple Lennard-Jones (6-12) potential is no longer adequate to give reasonable agreement between theory and experiment. When higher order attractive terms are included in the interaction, the agreement between theory and experiment is considerably improved. Argon and krypton give rise to strong interactions and frequency shifts toward the red.Numerical values are obtained for the dipole-dipole, dipole-quadrupole, dipole-octupole, and quadrupole-quadrupole terms in the intermolecular interaction. For each pair of interacting atoms, there are two parameters to fit two sets of data. For the case of the small perturbing atoms, one of the parameters is just the sum of the gas kinetic radii, so that there is essentially only one parameter which is adjusted to fit two pieces of data.The over-all agreement between theory and experiment is very good." @default.
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- W2034002283 date "1960-03-01" @default.
- W2034002283 modified "2023-09-25" @default.
- W2034002283 title "Frequency Shifts in the Hyperfine Spectra of Alkalis Caused by Foreign Gases" @default.
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- W2034002283 doi "https://doi.org/10.1103/physrev.117.1275" @default.
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