New infrared spectra of the nitrous oxide trimer

被引：18

作者：

Dehghany, M. ^{[1
]}

Afshari, Mahin ^{[1
]}

Moazzen-Ahmadi, N. ^{[1
]}

McKellar, A. R. W. ^{[2
]}

机构：

[1] Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, Canada

[2] Natl Res Council Canada, Steacie Inst Mol Sci, Ottawa, ON K1A 0R6, Canada

来源：

JOURNAL OF CHEMICAL PHYSICS | 2009年 / 130卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

infrared spectra; microwave spectra; molecular configurations; nitrogen compounds; rotational states; spectral line intensity; spectral line shift; vibrational states; N2O DIMER; MICROWAVE-SPECTRUM; LASER SPECTROSCOPY; OCS DIMER; POLAR; CM(-1);

D O I：

10.1063/1.3062957

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Infrared spectra of N2O trimers are studied using a tunable diode laser to probe a pulsed supersonic slit-jet expansion. A previous observation by Miller and Pedersen [J. Chem. Phys. 108, 436 (1998)] in the N2O nu(1)+nu(3) combination band region (similar to 3480 cm(-1)) showed the trimer structure to be noncyclic, with three inequivalent N2O monomer units which could be thought of as an N2O dimer (slipped antiparallel configuration) plus a third monomer unit lying above the dimer plane. The present observations cover the N2O fundamental band regions nu(3) (similar to 1280 cm(-1)) and nu(1) (similar to 2230 cm(-1)). In the nu(3) region, two trimer bands are assigned with vibrational shifts and other characteristics similar to those in the nu(1)+nu(3) region, but in the nu(1) region all three possible trimer bands are observed. Relationships among the various bands are considered with reference to their rotational intensity patterns, their vibrational shifts, and the properties of the related N2O dimer, with results that generally support the conclusions of Miller and Pedersen. Three trimer bands are also observed for the fully N-15-substituted species in the nu(1) region, and these results should aid in the detection of the as-yet-unobserved pure rotational microwave spectrum of the trimer.

引用

页数：6

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