ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The radio frequency and microwave spectrum of (SO2)2 has been measured using the molecular beam electric resonance technique. The spectrum is characteristic of an asymmetric top in which the two nonequivalent SO2 subunits interchange roles through a low frequency (70 kHz) tunneling motion. The spectroscopic constants obtained for SO2 dimer are: (B+C/2) (MHz) 926.160(2), (B−C/2) (MHz) 22.3207(1), A−(B+C/2) (MHz) 6032.3(6), ΔJ(MHz) 0.00217(2), ΔJK(MHz) 0.0995(1), δinv(MHz) 0.070(1), μa(D) 1.4052(13). The average distance between the centers of mass of the two subunits, RCM, is 3.825(10) A(ring). The magnitude of the weak bond stretching force constant ks is 0.0264(4) mdyn/A(ring). The relative orientation of the subunits is not well determined, but is demonstrated to be unlike the orientation of the nearest neighbors in the sulfur dioxide crystal.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.449421
