ZERO-FIELD-SPLITTING OF N-H RADICALS IN NOBLE GAS MATRICES BY MAGNETIC CIRCULAR DICHROISM SPECTROSCOPY
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Date
1982
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Ohio State University
Abstract
A magnetic circular dichroism (MCD) study of the $^{3}\Sigma^{-}\rightarrow^{3}\pi$ transition of the N-H radical isolated in Ar and Xe matrices is reported. The samples are prepared by passing a 1% mixture of $NH_{3}$ in the noble gas through a windowless discharge tube interfaced to the sample chamber of a superconducting solenoid. The MCD spectra are very sharp and intense and exhibit a strong, complex temperature dependence. A detailed study of this temperature dependence permits one to deduce the zero-field-spitting (D) of the $^{3}\Sigma^{-}$ ground state and the spin-orbit coupling constant $(\zeta)$ in the excited state. A preliminary analysis indicates that D is about 50% higher and $\zeta$ about 30% lower than the corresponding quantities in the gas phase.