The high-resolution absorption spectroscopy branch on the VUV beamline DESIRS at SOLEIL

Oliveira, N. de; Joyeux, D.; Roudjane, Mourad; Gil, J. F.; Pilette, Bertrand; Archer, Lucy; Ito, Kenji; Nahon, Laurent

doi:10.1107/s1600577516006135

Cited by 38 publications

(48 citation statements)

References 48 publications

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“…CO spectra are recorded at high resolution using the vacuumultraviolet Fourier-transform spectrometer (VUV-FTS) available on beamline DESIRS (Dichroïsme Et Spectroscopie par Interaction avec le Rayonnement Synchrotron) of the SOLEIL synchrotron. The beamline and spectrometer have been described in detail in previous publications (de Oliveira et al 2009(de Oliveira et al , 2011(de Oliveira et al , 2016Nahon et al 2012Nahon et al , 2013.…”

Section: Experimental Setup and Data Analysismentioning

confidence: 99%

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: Experimental Setup and Data Analysismentioning

confidence: 99%

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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“…Its operation and performance have already been described in detail [42,43] as well as its application for the measurement of CO spectra [24,27,44] cell (900 K) [45]. Doppler-broadening of the observed spectral lines increases at higher temperatures and limits the accuracy of line-center measurements.…”

Section: Fourier-transform Absorption In the Vacuum Ultraviolet (Vuv-ft)mentioning

confidence: 99%

“…These lines were induced by absorption upstream in the synchrotron beam line at the location of the gas filter used for discriminating the harmonics produced by the undulator [43]. Since these lines are Doppler broadened under static gas conditions there should be no shift of their centre frequencies.…”

Section: B 1 + ← X 1 + (0 0)mentioning

confidence: 99%

Perturbations in the A¹Π,v= 0 state of¹²C¹⁸O investigated via complementary spectroscopic techniques

et al. 2017

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“…The coupling of the VUV DESIRS beamline and a unique Fourier transform spectrometer (VUV-FTS) [39] simultaneously enables high spectral resolution (resolving power λ/∆λ up to ≈1 × 10 6 ) and broadband coverage over the full VUV spectral range [40].…”

Section: Methodsmentioning

confidence: 99%

Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma

Dedrick

Schröter

Niemi

et al. 2017

J. Phys. D: Appl. Phys.

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Radio-frequency driven atmospheric pressure plasmas are efficient sources for the production of reactive species at ambient pressure and close to room temperature. Pulsing the radio-frequency power input provides additional control over species production and gas temperature. Here, we demonstrate the controlled production of highly reactive atomic oxygen and nitrogen in a pulsed radio-frequency ( MHz) atmospheric-pressure plasma, operated with a small % air-like admixture (/ at ) through variations in the duty cycle. Absolute densities of atomic oxygen and nitrogen are determined through vacuum-ultraviolet absorption spectroscopy using the DESIRS beamline at the SOLEIL synchrotron coupled with a high resolution Fourier-transform spectrometer. The neutral-gas temperature is measured using nitrogen molecular optical emission spectroscopy. For a fixed applied-voltage amplitude (234 V), varying the pulse duty cycle from 10% to 100% at a fixed 10 kHz pulse frequency enables us to regulate the densities of atomic oxygen and nitrogen over the ranges of – and – , respectively. The corresponding 11 K increase in the neutral-gas temperature with increased duty cycle, up to a maximum of K, is relatively small. This additional degree of control, achieved through regulation of the pulse duty cycle and time-averaged power, could be of particular interest for prospective biomedical applications.

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The high-resolution absorption spectroscopy branch on the VUV beamline DESIRS at SOLEIL

Cited by 38 publications

References 48 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

Perturbations in the A¹Π,v= 0 state of¹²C¹⁸O investigated via complementary spectroscopic techniques

Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma

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The high-resolution absorption spectroscopy branch on the VUV beamline DESIRS at SOLEIL

Cited by 38 publications

References 48 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

Perturbations in the A1Π,v= 0 state of12C18O investigated via complementary spectroscopic techniques

Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma

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Perturbations in the A¹Π,v= 0 state of¹²C¹⁸O investigated via complementary spectroscopic techniques