DIODE INFRARED LASER DOUBLE RESONANCE OF SUBSTITUTED METHANES: SPECTROSCOPY AND $RELAXATION^{1}$

Author Institution: Department of Chemistry, Massachusetts Institute of Technology Cambridge; Physikalisches-Chemisches Institut der, Universitat Zurich CH-8057The $\nu_{5}\leftarrow0$ and 2$\nu_{5}\leftarrow\nu_{5}$ transitions in $CDF_{3}$, have been investigated by Diode-Infrared Laser-Double Resonance. Two-, three-, and four-level double-resonance and AC-Stark-modulated signals have been observed. Analysis of these spectra yields considerably improved molecular constants. Time-resolved measurements of rotational energy transfer indicate that the cross-section for self-relaxation is approximately fourteen times gas-kinetic, and that neighboring levels are populated with dipole-like ($\Delta J = \pm1,\Delta K = 0$) propensity rules. Preliminary result on $^{13}CD_{4}$ will also be reported. $^{1}$Supported by National Science Foundation Grant CHE81-09963