We have recorded the Fourier-transform infrared (FTIR) spectrum of the fundamental band of in a continuous supersonic jet expansion with an instrumental bandwidth of 0.0024 cm−1 (FWHM, full width at half maximum, unapodized), using a Bomem DA.002 spectrometer. Some parts of this band have also been recorded with 0.0007 cm−1 bandwidth using a diode laser spectrometer combined with a pulsed slit jet expansion. A multiple-pass arrangement has been used for the slit jet to observe low-intensity lines. In each case, we have used a mixture with a seeding ratio 1:3 leading to a rotational temperature of ca. 50 K. This work extends the previous investigation of Takami and Kuze [J. Chem. Phys. 80, 5994 (1984)] to much higher J transitions. In both P and R branches, rotational lines have been recorded for J up to 46–48. We have used a tensorial Hamiltonian adapted to the group chain and developed to the third order for the analysis of the spectra. A least-squares fit for each of the four main isotopic species: 182 183 184 and 186 results in band centers (in this order) 714.538 19, 714.214 06, 713.895 44, and 713.266 21 cm−1. We report furthermore first results on the high-resolution spectra of of which exhibits a fourfold degenerate electronic ground state of species in the group. Supersonic jet-FTIR spectra show a moderately structured relatively broad band, whereas the diode laser spectroscopy of the seeded jet in the range 708–733 cm−1 results in line resolved spectra of high complexity. A preliminary analysis is discussed, while a complete analysis still represents an appreciable challenge.
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15 August 2002
Research Article|
August 01 2002
High-resolution spectroscopy of the band of and in a supersonic jet
V. Boudon;
V. Boudon
Laboratoire de Physique de l’Université de Bourgogne (UMR CNRS 5027), 9 av. A. Savary, B.P. 47870, F-21078 Dijon, France
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M. Rotger;
M. Rotger
Laboratoire de Physique de l’Université de Bourgogne (UMR CNRS 5027), 9 av. A. Savary, B.P. 47870, F-21078 Dijon, France
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Y. He;
Y. He
Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland
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H. Hollenstein;
H. Hollenstein
Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland
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M. Quack;
M. Quack
Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland
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U. Schmitt
U. Schmitt
Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland
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J. Chem. Phys. 117, 3196–3207 (2002)
Article history
Received:
October 17 2000
Accepted:
March 13 2002
Citation
V. Boudon, M. Rotger, Y. He, H. Hollenstein, M. Quack, U. Schmitt; High-resolution spectroscopy of the band of and in a supersonic jet. J. Chem. Phys. 15 August 2002; 117 (7): 3196–3207. https://doi.org/10.1063/1.1475754
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