The Microwave Spectrum and Structure of NSF₃

The microwave spectra of NSF3 in vibrationally excited states

“…For %= 1 we obtained the value A6=5178.4 (1.7)MHz, which is close to that obtained by calculation from the r 0 structure given by Kirchhoff and Wilson [1] of 5159 MHz. The values of A 6 and A~6 z obtained are still highly correlated.…”

“…The low J values of Na2SFa, Na~SFa, NaasFa and 15Na2SFa were reported by Kirchhoff and Wilson [1], who also analysed the effects due to the nitrogen quadrupole for the 14N species. We have measured for the first time the mmwave rotational spectra of Na2SFa, Na~SFa and 15NSFa in natural abundance in order to obtain accurate values of the centrifugal distortion constants Dj ~ and Dj/~ ~ In some of our measurements the effects of the 14N quadrupole were still evident at high k. Downloaded by [University of California, San Diego] at 12:31 29 June 2016…”

“…The microwave spectrum of NSF 3 in the ground vibrational state was reported originally by Kirchhoff and Wilson [1]. They were able to show that the molecule is a Car symmetric top and they obtained an r 0 structure.…”

“…In particular, there was no coupling was assumed to be the same as that of the ground state [1] and calculation showed that for k = 0 there is no resolved hyperfine splitting, whereas for k = 3 there is a well resolved pattern if J"= 3. The observed fine structure was well fitted with the ground state quadrupole coupling constant and the (kl-1) assignments given previously.…”

“…--, ,, I,lllJl( The upper frequency group proved to be more of a problem. It was obvious that, following the precedent of v a = 1, these must be the transitions with (kl- 1) positive. However, at J"= 12 the upper group consists of only three strong absorptions.…”