Cavity ring-down UV spectroscopy of the C 2 Σ + -X 2 Π electronic transition of CH

Chris Medcraft, Harold Linnartz, Wim Ubachs

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Rotationally resolved spectra of the C 2 Σ + -X 2 Π electronic system of the CH radical were measured using cavity ring-down spectroscopy in supersonically expanding, planar hydrocarbon plasma. The experimental conditions allowed the study of highly excited rotational levels starting from vibrationally excited states. Here we present some 200+ new or more accurately recorded transitions in the 0–0, 1–1 and 2–2 vibronic bands in the ultraviolet between 30900 and 32400 cm −1 (324–309 nm). The resulting data, compared to earlier measurements, allows for the determination of more precise molecular constants for each vibrational state and therefore more precise equilibrium values. From this an equilibrium bond length of 1.115798(17)Å for the C 2 Σ + state is determined. A comprehensive list with observed transitions for each band has been compiled from all available experimental studies and constraints are placed on the predissociation lifetimes.

Original languageEnglish
Pages (from-to)15-23
Number of pages9
JournalJournal of Molecular Spectroscopy
Volume360
Early online date19 Apr 2019
DOIs
Publication statusPublished - Jun 2019

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Bond length
Hydrocarbons
Ultraviolet spectroscopy
Excited states
Spectroscopy
methylidyne
Plasmas
cavities
rings
electronics
vibrational states
lists
spectroscopy
hydrocarbons
life (durability)
excitation

Cite this

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title = "Cavity ring-down UV spectroscopy of the C 2 Σ + -X 2 Π electronic transition of CH",
abstract = "Rotationally resolved spectra of the C 2 Σ + -X 2 Π electronic system of the CH radical were measured using cavity ring-down spectroscopy in supersonically expanding, planar hydrocarbon plasma. The experimental conditions allowed the study of highly excited rotational levels starting from vibrationally excited states. Here we present some 200+ new or more accurately recorded transitions in the 0–0, 1–1 and 2–2 vibronic bands in the ultraviolet between 30900 and 32400 cm −1 (324–309 nm). The resulting data, compared to earlier measurements, allows for the determination of more precise molecular constants for each vibrational state and therefore more precise equilibrium values. From this an equilibrium bond length of 1.115798(17){\AA} for the C 2 Σ + state is determined. A comprehensive list with observed transitions for each band has been compiled from all available experimental studies and constraints are placed on the predissociation lifetimes.",
author = "Chris Medcraft and Harold Linnartz and Wim Ubachs",
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language = "English",
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pages = "15--23",
journal = "Journal of Molecular Spectroscopy",
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Cavity ring-down UV spectroscopy of the C 2 Σ + -X 2 Π electronic transition of CH. / Medcraft, Chris; Linnartz, Harold; Ubachs, Wim.

In: Journal of Molecular Spectroscopy, Vol. 360, 06.2019, p. 15-23.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Cavity ring-down UV spectroscopy of the C 2 Σ + -X 2 Π electronic transition of CH

AU - Medcraft, Chris

AU - Linnartz, Harold

AU - Ubachs, Wim

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N2 - Rotationally resolved spectra of the C 2 Σ + -X 2 Π electronic system of the CH radical were measured using cavity ring-down spectroscopy in supersonically expanding, planar hydrocarbon plasma. The experimental conditions allowed the study of highly excited rotational levels starting from vibrationally excited states. Here we present some 200+ new or more accurately recorded transitions in the 0–0, 1–1 and 2–2 vibronic bands in the ultraviolet between 30900 and 32400 cm −1 (324–309 nm). The resulting data, compared to earlier measurements, allows for the determination of more precise molecular constants for each vibrational state and therefore more precise equilibrium values. From this an equilibrium bond length of 1.115798(17)Å for the C 2 Σ + state is determined. A comprehensive list with observed transitions for each band has been compiled from all available experimental studies and constraints are placed on the predissociation lifetimes.

AB - Rotationally resolved spectra of the C 2 Σ + -X 2 Π electronic system of the CH radical were measured using cavity ring-down spectroscopy in supersonically expanding, planar hydrocarbon plasma. The experimental conditions allowed the study of highly excited rotational levels starting from vibrationally excited states. Here we present some 200+ new or more accurately recorded transitions in the 0–0, 1–1 and 2–2 vibronic bands in the ultraviolet between 30900 and 32400 cm −1 (324–309 nm). The resulting data, compared to earlier measurements, allows for the determination of more precise molecular constants for each vibrational state and therefore more precise equilibrium values. From this an equilibrium bond length of 1.115798(17)Å for the C 2 Σ + state is determined. A comprehensive list with observed transitions for each band has been compiled from all available experimental studies and constraints are placed on the predissociation lifetimes.

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