H. Fichoux et al., DOUBLE-RESONANCE SUB-DOPPLER STUDY OF THE ALLOWED AND DELTA-K=-3 FORBIDDEN Q(3,3) TRANSITIONS TO THE NU(2) VIBRATIONAL-STATE OF (NH3)-N-14, Journal of molecular spectroscopy (Print), 192(1), 1998, pp. 169-178
Citations number
37
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy,"Physics, Atomic, Molecular & Chemical
The IR-IR sub-Doppler double resonance and standard saturation sideban
d spectroscopy have been used to measure the allowed and Delta k = -3
forbidden transitions to the upsilon(2) vibrational level of (NH3)-N-1
4. The IR-IR double resonance technique has made it possible to observ
e quadrupole hyperfine structures which correspond to the sums as well
as differences of the (-3)Q(3, 3) and Q(3, 3) hyperfine components. T
he ''sum'' and ''difference'' double resonance frequencies have been m
easured with accuracy better than 30 and 5 KHz, respectively. In addit
ion to this, the hyperfine structure of the allowed Q(3, 3) transition
has been independently measured using the ''standard'' saturation sid
eband spectroscopy with accuracy better than 15 KHz. A simultaneous an
alysis of all measured data provides an improved set of effective nucl
ear quadrupole and spin-rotation parameters for the excited upsilon(2)
vibrational state and frequencies of the ''pure'' rotation-vibration
transitions deperturbed from the hyperfine effects at the experimental
sample pressure of about 3 mTorr, including a very precise zero press
ure value of the ''forbidden'' spacing between energies of the upsilon
(2)\s, J = 3, K = 3] and \s, J = 3, K = 0] pure rotational levels of 2
883.6795(19) MHz [0.096189194(63) cm(-1)]. (C) 1998 Academic Press.