Ortho-Para-Dependent Pressure Effects Observed in the Near Infrared Band of Acetylene by Dual-Comb Spectroscopy

Kana Iwakuni, Sho Okubo, Koichi M T Yamada, Hajime Inaba, Atsushi Onae, Feng Lei Hong, Hiroyuki Sasada

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We demonstrate that dual-comb spectroscopy, which allows one to record broadband spectra with high frequency accuracy in a relatively short time, provides a real advantage for the observation of pressure-broadening and pressure-shift effects. We illustrate this with the ν1+ν3 vibration band of C212H2. We observe transitions from P(26) to R(29), which extend over a 3.8 THz frequency range, at six pressures ranging up to 2654 Pa. Each observed absorption line profile is fitted to a Voigt function yielding pressure-broadening and pressure-shift coefficients for each rotation-vibration transition. The effectiveness of this technique is such that we are able to discern a clear dependence of the pressure-broadening coefficients on the nuclear spin state, i.e., on the ortho or para modification. This information, combined with the pressure-shift coefficients, can facilitate a detailed understanding of the mechanism of molecular collisions.

Original languageEnglish
Article number143902
JournalPhysical Review Letters
Volume117
Issue number14
DOIs
Publication statusPublished - 2016 Sep 29

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pressure effects
acetylene
pressure broadening
spectroscopy
shift
coefficients
molecular collisions
vibration
nuclear spin
frequency ranges
broadband
profiles

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Iwakuni, K., Okubo, S., Yamada, K. M. T., Inaba, H., Onae, A., Hong, F. L., & Sasada, H. (2016). Ortho-Para-Dependent Pressure Effects Observed in the Near Infrared Band of Acetylene by Dual-Comb Spectroscopy. Physical Review Letters, 117(14), [143902]. https://doi.org/10.1103/PhysRevLett.117.143902

Ortho-Para-Dependent Pressure Effects Observed in the Near Infrared Band of Acetylene by Dual-Comb Spectroscopy. / Iwakuni, Kana; Okubo, Sho; Yamada, Koichi M T; Inaba, Hajime; Onae, Atsushi; Hong, Feng Lei; Sasada, Hiroyuki.

In: Physical Review Letters, Vol. 117, No. 14, 143902, 29.09.2016.

Research output: Contribution to journalArticle

Iwakuni, Kana ; Okubo, Sho ; Yamada, Koichi M T ; Inaba, Hajime ; Onae, Atsushi ; Hong, Feng Lei ; Sasada, Hiroyuki. / Ortho-Para-Dependent Pressure Effects Observed in the Near Infrared Band of Acetylene by Dual-Comb Spectroscopy. In: Physical Review Letters. 2016 ; Vol. 117, No. 14.
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