Density effects on highn molecular Rydberg states: CH_{3}I and C_{6}H_{6} in H_{2} and Ar
Abstract
The absorption spectra of highn Rydberg states of methyl iodide and benzene perturbed by varying number densities of hydrogen or argon, range 0.9×10^{2}^{0}10.5×10^{2}^{0} cm^{}^{3} for H_{2} and 0.6×10^{2}^{0}7.5×10^{2}^{0} cm^{}^{3} for Ar, have been investigated. The highn molecular states of both absorbers were found to shift linearly with the number density of atomic Ar and molecular H_{2} scatterers. The Fermi formula modified by the AlekseevSobel'man polarization term provides an excellent fit of the shift data. The electron scattering lengths obtained are: 0.93 a_{0} for H_{2} and 1.63 a_{0} for Ar using the CH_{3}I absorber; and 0.99 a_{0} for H_{2} and 1.57 a_{0} for Ar using the C_{6}H_{6} absorber. The electron scattering lengths for H_{2} and Ar agree with the results of an empirical model that correlates scattering lengths and the polarizabilities α(spherical) for inert atoms and α_{2}(nonspherical) for H_{2} molecule.
 Publication:

Journal of Chemical Physics
 Pub Date:
 November 1989
 DOI:
 10.1063/1.457616
 Bibcode:
 1989JChPh..91.5170A