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

Citation
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
ISSN journal
0022-2852
Volume
192
Issue
1
Year of publication
1998
Pages
169 - 178
Database
ISI
SICI code
0022-2852(1998)192:1<169:DSSOTA>2.0.ZU;2-U
Abstract
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.