Analysis of l-type resonance in the microwave spectrum of trioxane in states υ1(E) = 1 and υ2(E) = 1

✍ Scribed by A.P. Cox; D.J. Finnigan; M.J. Whittle

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 586 KB
• Volume: 25
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(74)85335-2

✦ Synopsis

the perturbation formula are evident even at the J= 6

Miliimetre wave spectra of trioxane, (CHzO)g , in its ground state and several excited vibrational states have been reported by Bellet-et al. [l] _ Measured rotational transitions of two degenerate states v,(E) = 1 and u2(E) = 1 were analysed using the perturbation formula of Grenier-Besson and Amat [2] _ Significant discrepancies between calculated and observed frequencies were obtained for both states, particularly for high J, low Kl -1 transitions of the u2(E) = 1 state. The perturbation treatment is only expected to be valid [2] if the following inequalities hold: * 7transition. Errors arise therefore through the use of the perturbation treatment due to Z-type resonance associated with the (Z, KIHVR1Z+2, K+ 2) matrix elements, where H& is the vibration-rotation hamil-.tonian. The presence of i-type resonance precludes rtype resonance effects, associated with the (1, KI HVR I I+ 2, K 7 1) elements, arising from inekprality (1 b). Other, higher order, off-diagonal elements might contribute, however, and to test this point we have treated the I-type resonance accurately by diagonalisation.