Heteronuclear Diatomic and Triatomic Molecules

Breckenridge and Umemoto provided sample calculations based on the reaction of Mg( Pi) with H2 to demonstrate that the effective delay time for secondary collisions of the MgH product is different from the delay time 

laser excitation of high vibrational levels of CO(X 2 ) was shown to produce VUV emission from CO(A n). The possibility of making use of this frequency up-conversion in a CO electronic laser was discussed. The rotational relaxation of C 0(A lI),t) = 13, J = 13 by various gases has been described by Vikis. Relaxation rates were found to correlate with the reduced mass of the quencher for all collision partners except Xe, and for 

Fluorescence liftimes of the predissociative NO(B n),u = 7 state measured in pure NO and in the presence of O2, N2, H2, Ar, and He have been reported. A value of 0.33 0.03 (xs was obtained for the zero-pressure lifetime from which an estimation of the value for the quantum yield of fluorescence of 0.15 was made. ArF laser radiation was used to excite rotational levels between J = 45/2—67/2, the energies of which exceed the dissociation limits of both the B IIi,2.t = 7 and = 7 states. Quenching 

Dutton et examined the efficiency of rotational relaxation of SO2 by various gases by measuring the terminal translational and rotational temperatures of SO2 seeded in various supersonic molecular beams. They noted that an increase in relaxation efficiency was obtained with increasing temperature in each case. Rotationally cold SO2 was prepared in a supersonic expansion of SO2 seeded in Ar and excited to the first electronically allowed state, A A2, by pulsed laser radiation in the range 300-320 Time-resolved measure- 

Hancock and H. Zacharias, Quantum Electron. Electro-opt., Proc. Natl. Quantum Electron. Conf., 5th, 1981 (publ. 1983), 145. 

---