Fourier transform spectroscopy of the CO Ångström bands

Floch, A. C. Le; Amiot, C.

doi:10.1016/0301-0104(85)87046-4

Cited by 35 publications

(22 citation statements)

References 10 publications

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“…These corrections were applied to all isotopologues as their spectra are placed, as mentioned above, on a unique scale. Our term values are consistent within the uncertainty with those calculated by Le Floch & Amiot (1985) and Haridass et al (1994), the latter resulting from the combination of B-A data with highresolution A-X data obtained with the former Ottawa 10.6 m vacuum-grating spectrograph. For 12 C 16 O B00, the average difference between our values and the Daprà et al (2016) values is 5.0 × 10 −6 nm.…”

Section: B 1 σ + Statesupporting

confidence: 88%

“…This work revisits and completes, 25 yr later, part of the CO atlas of transition frequencies started by the Paris-Meudon Observatory team (Eidelsberg et al 1991;Le Floch 1992), and initiated by the work of Letzelter et al (1987) and Viala et al (1988) on the photoabsorption and photodissociation cross sections, either measured or calculated for the four isotopologues 12 C 16 O, 12 C 18 O, 13 C 16 O, and 13 C 18 O. It improves and completes calculations derived from the combination of earlier low-resolution measurements of term values and molecular constants of B00 and B10 for 12 C 16 O ( Le Floch & Amiot 1985), of C00 and E00 for 12 C 16 O ( Le Floch 1992), and of B00, B10, C00 and E00 for 12 C 18 O and 13 C 18 O (Haridass et al 1994). Line positions of B20 for 12 C 16 O have been studied by Baker & Launay (1994).…”

Section: Introductionmentioning

confidence: 67%

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Atlas of new and revised high-resolution spectroscopy of six CO isotopologues in the 101–115 nm range

Lemaire

Heays

Eidelsberg

et al. 2018

A&A

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Atlas of new and revised high-resolution spectroscopy of six COisotopologues in the 101-115 nm range Transition energies of the u = 0, 1, 2, and 3 to u = 0 bands of the B 1 Σ + , C 1 Σ + , and E 1 Π to X 1 Σ + states, related term values, and molecular constants ABSTRACT Our knowledge of astronomical environments containing CO depends on accurate molecular data to reproduce and interpret observed spectra. The recent and future improvements of ultraviolet space instrumentation, both in sensitivity and resolution, require increasingly detailed laboratory molecular spectroscopy as a reference. As part of a long-term experimental campaign at the SOLEIL Synchrotron facility, we have acquired gas-phase absorption spectra of six CO isotopologues in the vacuum ultraviolet. These spectra are recorded using the Fourier-transform spectrometer installed on the DESIRS beamline, providing a unique resolving power up to 10 6 in the 8-13 eV range. We have used resolutions in the 300 000-450 000 range for this campaign, which enable the analysis of individual line positions. We report new measurements on neighboring Rydberg states in the 101-115 nm range that could also be used as f -value calibrators, namely B 1 Σ + , C 1 Σ + , and E 1 Π, for six CO isotopologues. This range encompasses the absorption transitions B(v = 0, 1, and 2), C(v = 0, 1, 2, and 3), and E(v = 0, 1, 2, and 3) from X 1 Σ + (v = 0). Higher resolution laser-based measurements of CO isotopologues from the literature are used to improve the absolute calibration and accuracy of our data. The overall uncertainty of the great majority of the line positions presented in this atlas is estimated to be 0.01 cm −1 . In addition, some of the data derived from transition energies measurements, such as term values and molecular constants, are obtained for the first time, and others are improvements on previous sparser or lower spectral resolution datasets.Article published by EDP Sciences A114, page 1 of 62 A&A 614, A114 (2018) A114, page 3 of 62 A&A 614, A114 (2018) Laser calibration benchmarks and associated dataAn absolute calibration of lines requires the availability of accurately determined standards, either atomic or molecular, as close as possible to the lines under study. There are many reported laser-based measurements of CO VUV transitions with accurate absolute calibrations based on primary standards. Some previous work has been limited to a few lines of each vibrational band, while others offer almost complete bands for use as comparisons for calibration purposes. Data like this exist for most CO isotopologues. They are summarized in detail in this section. Reports of laser-based measurements that were used to accurately calibrate our spectra often also presented an analysis of the rotational structure of the bands under study, providing associated data such as term values, reduced term values, and molecular constants. These results are also mentioned in detail in this section as they are compared later to our own results.Depending on the data available, laser...

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Section: B 1 σ + Statesupporting

confidence: 88%

Section: Introductionmentioning

confidence: 67%

Atlas of new and revised high-resolution spectroscopy of six CO isotopologues in the 101–115 nm range

Lemaire

Heays

Eidelsberg

et al. 2018

A&A

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“…The corresponding rotational constants, such as those determining the rotational line positions, etc. are taken from the Herzberg's works . A Gaussian profile with a full width at half maximum (FWHM) of ≈1.7 cm −1 is supposed to describe the instrumental function of the used monochromator.…”

Section: Resultsmentioning

confidence: 99%

Experimental and Theoretical Study of the Plasma Chemistry of Ethyl Lactate Plasma Polymerization Discharges

Ligot

Guillaume

Raynaud

et al. 2014

Plasma Processes & Polymers

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In this work, a new plasma diagnostic method has been used to quantify the plasma-generated species that play a part in the ethyl lactate plasma polymer film deposition. This method has been possible by using the RGA mass spectrometry combined with the in situ FTIR spectroscopy supported by DFT calculations. Ethyl lactate plasma phase can then be qualitatively and quantitatively probed by varying the experimental parameters. More specifically, it has been shown that by increasing the power from 30 to 280 W, the density of ester-bearing species in the plasma strongly decreases and supports the drop of ester content in plasma polymers. Additionally, the temperature of the plasma has been determined by the in situ IR spectroscopy and has revealed a too weak increase (60 K) to affect the fundamental vibrational levels. Our IR spectroscopy approach goes into that direction too.

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“…For high J levels (up to J = 75 for Va = 0), accurate term values were obtained by Brown from high temperature absorption spectra [12]. (ii) Fourier transform spectra of the 0 -Va (Va = 0-3) bands of the (B-A) system (400-600nm region) [13]. These data, combined with Kepa and Rytel's [14] conventional spectroscopy data, provided accurate term values for A 1II, v = 0-4 levels up to J ~ 40.…”

Section: Discussionmentioning

confidence: 99%

TheA¹Π ∼D¹Δ rotation-electronic interaction in CO

Floch

Rostas

Schamps³

1988

Molecular Physics

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All available experimental data pertinent to the A 1H (v = 0~) and D 1A state of CO have been used to derive five independent values for the rotationelectronic interaction parameter b(A ~ D). The experimental values concern a narrow R centroid region (1.21 < R < 1-32/~). The mean value b(A ~ D)= 0.12 ___ 0-01 is much smaller than the value (0.48) predicted by ab initio SCFCI calculations which have been carried out for several internuclear distances. The experimental and calculated values for the A 1H ~ 1137-and a3H ~ a'3E +, e aZ -, d aA rotation-electronic perturbations available in the literature are also discussed.

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Fourier transform spectroscopy of the CO Ångström bands

Cited by 35 publications

References 10 publications

Atlas of new and revised high-resolution spectroscopy of six CO isotopologues in the 101–115 nm range

Atlas of new and revised high-resolution spectroscopy of six CO isotopologues in the 101–115 nm range

Experimental and Theoretical Study of the Plasma Chemistry of Ethyl Lactate Plasma Polymerization Discharges

TheA¹Π ∼D¹Δ rotation-electronic interaction in CO

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Fourier transform spectroscopy of the CO Ångström bands

Cited by 35 publications

References 10 publications

Atlas of new and revised high-resolution spectroscopy of six CO isotopologues in the 101–115 nm range

Atlas of new and revised high-resolution spectroscopy of six CO isotopologues in the 101–115 nm range

Experimental and Theoretical Study of the Plasma Chemistry of Ethyl Lactate Plasma Polymerization Discharges

TheA1Π ∼D1Δ rotation-electronic interaction in CO

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TheA¹Π ∼D¹Δ rotation-electronic interaction in CO