High-resolution oscillator strength measurements of the CO B 1Σ+-Χ 1Σ+ (0, 0) and (1, 0) vibrational bands

Glenn Stark; Brenton R. Lewis; Stephen T. Gibson; Julian P. England

doi:10.1086/307493

High-resolution oscillator strength measurements of the CO B ¹Σ⁺-Χ ¹Σ⁺ (0, 0) and (1, 0) vibrational bands

Glenn Stark^*, Brenton R. Lewis, Stephen T. Gibson, Julian P. England

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

Large discrepancies in the published photoabsorption oscillator strengths of the vacuum-ultraviolet (VUV) bands of CO hamper the interpretation of VUV astronomical observations. We report new oscillator strength measurements of the (0, 0) and (1, 0) bands of the CO B ¹Σ⁺-Χ ¹Σ⁺ electronic system determined from high-resolution (resolving power ≈750,000) absorption spectra recorded with a tunable VUV laser system. The instrumental bandwidth (∼0.14 cm^-1 FWHM) was significantly less than the widths of the Doppler-broadened CO lines (∼0.20 cm ^-1 FWHM). The Β(0)-Χ(0) and Β(1)-Χ(0) band oscillator strengths, derived from measurements of the photoabsorption cross sections of 36 individual rotational lines, are (6.5 ± 0.6) × 10^-3 and (1.1 ± 0.1) × 10^-3, respectively. Our results are compared with other recent laboratory measurements and with ab initio calculations.

Original language	English
Pages (from-to)	732-736
Number of pages	5
Journal	Astrophysical Journal
Volume	520
Issue number	2 PART 1
DOIs	https://doi.org/10.1086/307493
Publication status	Published - 1 Aug 1999

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@article{837d46295eb042e78616751b12de7a7f,

title = "High-resolution oscillator strength measurements of the CO B 1Σ+-Χ 1Σ+ (0, 0) and (1, 0) vibrational bands",

abstract = "Large discrepancies in the published photoabsorption oscillator strengths of the vacuum-ultraviolet (VUV) bands of CO hamper the interpretation of VUV astronomical observations. We report new oscillator strength measurements of the (0, 0) and (1, 0) bands of the CO B 1Σ+-Χ 1Σ+ electronic system determined from high-resolution (resolving power ≈750,000) absorption spectra recorded with a tunable VUV laser system. The instrumental bandwidth (∼0.14 cm-1 FWHM) was significantly less than the widths of the Doppler-broadened CO lines (∼0.20 cm -1 FWHM). The Β(0)-Χ(0) and Β(1)-Χ(0) band oscillator strengths, derived from measurements of the photoabsorption cross sections of 36 individual rotational lines, are (6.5 ± 0.6) × 10-3 and (1.1 ± 0.1) × 10-3, respectively. Our results are compared with other recent laboratory measurements and with ab initio calculations.",

keywords = "ISM: molecules, Molecular data, Ultraviolet: ISM",

author = "Glenn Stark and Lewis, {Brenton R.} and Gibson, {Stephen T.} and England, {Julian P.}",

year = "1999",

month = aug,

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doi = "10.1086/307493",

language = "English",

volume = "520",

pages = "732--736",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - High-resolution oscillator strength measurements of the CO B 1Σ+-Χ 1Σ+ (0, 0) and (1, 0) vibrational bands

AU - Stark, Glenn

AU - Lewis, Brenton R.

AU - Gibson, Stephen T.

AU - England, Julian P.

PY - 1999/8/1

Y1 - 1999/8/1

N2 - Large discrepancies in the published photoabsorption oscillator strengths of the vacuum-ultraviolet (VUV) bands of CO hamper the interpretation of VUV astronomical observations. We report new oscillator strength measurements of the (0, 0) and (1, 0) bands of the CO B 1Σ+-Χ 1Σ+ electronic system determined from high-resolution (resolving power ≈750,000) absorption spectra recorded with a tunable VUV laser system. The instrumental bandwidth (∼0.14 cm-1 FWHM) was significantly less than the widths of the Doppler-broadened CO lines (∼0.20 cm -1 FWHM). The Β(0)-Χ(0) and Β(1)-Χ(0) band oscillator strengths, derived from measurements of the photoabsorption cross sections of 36 individual rotational lines, are (6.5 ± 0.6) × 10-3 and (1.1 ± 0.1) × 10-3, respectively. Our results are compared with other recent laboratory measurements and with ab initio calculations.

AB - Large discrepancies in the published photoabsorption oscillator strengths of the vacuum-ultraviolet (VUV) bands of CO hamper the interpretation of VUV astronomical observations. We report new oscillator strength measurements of the (0, 0) and (1, 0) bands of the CO B 1Σ+-Χ 1Σ+ electronic system determined from high-resolution (resolving power ≈750,000) absorption spectra recorded with a tunable VUV laser system. The instrumental bandwidth (∼0.14 cm-1 FWHM) was significantly less than the widths of the Doppler-broadened CO lines (∼0.20 cm -1 FWHM). The Β(0)-Χ(0) and Β(1)-Χ(0) band oscillator strengths, derived from measurements of the photoabsorption cross sections of 36 individual rotational lines, are (6.5 ± 0.6) × 10-3 and (1.1 ± 0.1) × 10-3, respectively. Our results are compared with other recent laboratory measurements and with ab initio calculations.

KW - ISM: molecules

KW - Molecular data

KW - Ultraviolet: ISM

UR - http://www.scopus.com/inward/record.url?scp=0033430637&partnerID=8YFLogxK

U2 - 10.1086/307493

DO - 10.1086/307493

M3 - Article

SN - 0004-637X

VL - 520

SP - 732

EP - 736

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 1

ER -

High-resolution oscillator strength measurements of the CO B ¹Σ⁺-Χ ¹Σ⁺ (0, 0) and (1, 0) vibrational bands

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