Abstract
Pulsed laser piezoelectric transducer (PULPIT) optoacoustic spectroscopy has been used to obtain vibrational absorption spectra of hcp solid normal and para-hydrogen. The ability of PULPIT spectroscopy to quantitatively measure very small absorption coefficients in condensed phase materials1 has permitted observation of zero phonon transitions and phonon branches of overtone absorptions up to Δv = 4. The zero phonon transitions arise only from the internal excitations of H2 molecules and are due to the dipole moments induced by quadrupolar interactions. Associated with these sharp zero phonon lines (linewidths ≤ 1 cm-1) are broad pho- non branches which arise from combined internal excitation of H2 molecules and excitation of crystal lattice vibrations
© 1983 Optical Society of America
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