High resolution spectroscopy of second overtone transitions in solid parahydrogen.
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Date
1995
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Publisher
Ohio State University
Abstract
The high resolution spectrum of the parahydrogen $Q_{3} (0)$ transition at $11758 cm^{-1}$ has allowed us to make a specific quantum state assignment of the ten lines which compose this transition. The transition cannot occur unless a dipole moment is induced in the parahydrogen by an external field. The quadrupole field of an impurity $o-H_{2}$ molecule provides this field, and the transition occurs in the orientationally dependent field of the orthohydrogen molecule. Transitions induced by the quadrupolar field of the $J = 1 H_{2}$ in the nearest neighbor as well as in the next nearest neighbor shells have been observed. By lowering the impurity orthohydrogen concentration, we have observed lines with linewidths of approximately 15 MHz hwhm with our Ti: Sapphire laser with a sensitivity of $3\times 10^{-5} (\Delta 1/1)$ using the toneburst method. Additionally the second vibrational overtone of the impurity orthohydrogen molecule $(Q_{3}(1))$ has been observed at $11741.26 cm^{-1}$.
Description
Author Institution: The University of Chicago, Chicago, IL 60637; Kyoto University, Kyoto, Japan