DOI: 10.1063/1.457073. Diode laser spectroscopy of gas phase C5: The ν3 fundamental and associated hot bands

Diode laser spectroscopy of gas phase C5: The ν3 fundamental and associated hot bands

10.1063/1.457073

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The spectrum of the linear carbon chain molecule C5 in the gas phase has been studied around 2170 cm−1, the region of the highest asymmetric stretching vibration ν3. The results were obtained using a tunable diode laser spectrometer and a cooled hollow cathode discharge in a flowing mixture of acetylene and helium. Four vibration–rotation bands were assigned and analyzed: the fundamental, a hot band arising from the v7=1, l=1 vibrational level, a second hot band arising from v7=2, l=0, and a third hot band tentatively ascribed to v5=1, l5=1. Small local perturbations were found to affect the upper vibrational states of two of the bands. Analysis of the data yielded accurate values for a number of molecular parameters for C5, e.g., the band origin ν3= 2169.4410(2) cm−1, the rotational constant, B0 =2557.63(9) MHz, and the l-type doubling parameters, q7=3.99(6) MHz, and q5=2.36(9) MHz. The value of q7 may be used to estimate a value of 118 cm−1 for the lowest bending frequency of the molecule. There is no evidence in C5 for quasilinear behavior such as that shown by C3 and C3O2.

Bibliography

Moazzen-Ahmadi, N., McKellar, A. R. W., & Amano, T. (1989). Diode laser spectroscopy of gas phase C5: The Î½3 fundamental and associated hot bands. The Journal of Chemical Physics, 91(4), 2140â2147.

Authors 3

N. Moazzen-Ahmadi (first)
A. R. W. McKellar (additional)
T. Amano (additional)

References 27 Referenced 77

{'key': '2024021008361691100_r1'}
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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:12 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 5:23 a.m.)
Indexed	4 months, 3 weeks ago (April 9, 2025, 7:46 a.m.)
Issued	36 years ago (Aug. 15, 1989)
Published	36 years ago (Aug. 15, 1989)
Published Print	36 years ago (Aug. 15, 1989)

Funders 0

None

BibTeX

@article{Moazzen_Ahmadi_1989, title={Diode laser spectroscopy of gas phase C5: The ν3 fundamental and associated hot bands}, volume={91}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.457073}, DOI={10.1063/1.457073}, number={4}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Moazzen-Ahmadi, N. and McKellar, A. R. W. and Amano, T.}, year={1989}, month=aug, pages={2140–2147} }

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  "abstract": "<jats:p>The spectrum of the linear carbon chain molecule C5 in the gas phase has been studied around 2170 cm\u22121, the region of the highest asymmetric stretching vibration \u03bd3. The results were obtained using a tunable diode laser spectrometer and a cooled hollow cathode discharge in a flowing mixture of acetylene and helium. Four vibration\u2013rotation bands were assigned and analyzed: the fundamental, a hot band arising from the v7=1, l=1 vibrational level, a second hot band arising from v7=2, l=0, and a third hot band tentatively ascribed to v5=1, l5=1. Small local perturbations were found to affect the upper vibrational states of two of the bands. Analysis of the data yielded accurate values for a number of molecular parameters for C5, e.g., the band origin \u03bd3= 2169.4410(2) cm\u22121, the rotational constant, B0 =2557.63(9) MHz, and the l-type doubling parameters, q7=3.99(6) MHz, and q5=2.36(9) MHz. The value of q7 may be used to estimate a value of 118 cm\u22121 for the lowest bending frequency of the molecule. There is no evidence in C5 for quasilinear behavior such as that shown by C3 and C3O2.</jats:p>",
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