✦ LIBER ✦

The Far Infrared Spectrum of the NO Dimer

✍ Scribed by A.R.W. McKellar; J.K.G. Watson

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 145 KB
Volume: 194
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.1998.7798

No coin nor oath required. For personal study only.

✦ Synopsis

The far-infrared spectrum of the NO dimer in the gas phase has been observed for the first time using a long-path (180 m) cooled (99 K) absorption cell and a Bomem Fourier transform spectrometer. Four weak vibration-rotation bands were detected in the 120 -450 cm Ϫ1 region and assigned to intermolecular vibrations of the cis-planar ON-NO complex. The strongest is a type b band at 239.36 cm Ϫ1 , which is assigned as the 2 (symmetric bending) fundamental. A second type b band at 134.50 cm Ϫ1 , partly obscured by 2 ⌸ 3/2 4 2 ⌸ 1/2 transitions of the NO monomer, is assigned as the 3 (intermolecular stretch) fundamental. A third type b band at 351.38 cm Ϫ1 can then be assigned as the 2 ϩ 3 combination band. Finally, a very weak type a band at 429.14 cm Ϫ1 is assigned as the 6 (antisymmetric bending) fundamental. We report here detailed analyses of the 2 and 2 ϩ 3 bands, which yielded upper state rotational parameters, centrifugal distortion parameters, and band origins. Somewhat less extensive analyses for 3 and 6 give their rotational parameters and band origins. These results resolve the mystery of the true values of the intermolecular vibrational frequencies of the NO dimer, which turn out to be rather different from previous determinations based on condensed phase spectra.

📜 SIMILAR VOLUMES

The Far-Infrared Spectrum of HI

✍ K.V. Chance; T.D. Varberg; K. Park; L.R. Zink 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 367 KB

We have measured the rotational spectrum of \(\mathrm{H}^{127} \mathrm{I}\) from 0.38 to \(4.58 \mathrm{THz}\left(13-153 \mathrm{~cm}^{-1}\right)\), encompassing the \(R(0)\) through \(R(11)\) rotational lines. using the \(\mathrm{CO}_{2}\) laser difference method for generating coherent far-infrare

The Far-Infrared Spectrum of Deuterium I

The Far-Infrared Spectrum of Deuterium Iodide

✍ Thomas D. Varberg; John C. Roberts; Kai A. Tuominen; Kenneth M. Evenson 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 87 KB

TABLE 2 Rotational and 127 I Hyperfine Parameters for DI (in MHz) a Values in parentheses indicate 1 uncertainties of the last digits.

Millimeter-Wave Spectrum of the NO Dimer

✍ M.D. Brookes; A.R.W. McKellar; T. Amano 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 152 KB

The pure rotational spectrum of the NO dimer, (14N16O)2, has been studied in the 225-400 GHz millimeter-wave region by means of direct absorption in a supersonic jet expansion. Previously, only 4 rotational transitions of (NO)2 had been measured in the microwave region. To these, we have added 66 ne

Far-Infrared Rotational Spectrum of ArD+

✍ Hitoshi Odashima; Atsushi Kozato; Fusakazu Matsushima; Shozo Tsunekawa; Kojiro T 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 76 KB

Rotational transition frequencies of ArD ϩ were measured with an accuracy of a few hundred kilohertz in the 0.95-4.7 THz region, using a tunable far-infrared radiation source. Effective rotational parameters B, D, and H were determined for the ground vibrational state. The observed frequencies were

The High-Resolution Far-Infrared Torsion

The High-Resolution Far-Infrared Torsional Spectrum of Ethane

✍ N. Moazzen-Ahmadi; E. Kelly; J. Schroderus; V.-M. Horneman 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 101 KB

The far-infrared spectrum of gaseous CH 3 CH 3 has been measured at a resolution of 0.0016 cm -1 using a Fourier transform spectrometer. The spectrum was recorded with an absorption pathlength of 172 m. The temperature and pressure of the sample were 294 K and 10 Torr, respectively. A total of 1072

The High-Resolution FTIR Far-Infrared Sp

The High-Resolution FTIR Far-Infrared Spectrum of Formamide

✍ Don McNaughton; Corey J. Evans; Samantha Lane; Claus J. Nielsen 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 450 KB

The far-infrared spectrum of formamide (HCONH2) has been recorded at high resolution and over 9000 vibration-rotation lines assigned. Molecular parameters from the rovibrational analyses of the unperturbed 12(1)0 out-of-plane vibration band have been obtained for the ground state and the excited sta