Sensitive fluorescence spectroscopy of jet cooled 15NO2

Volkers, E.; Vredenborg, A.; Linnartz, H.; Bulthuis, J.; Stolte, S.; Jost, R.

doi:10.1016/j.cplett.2004.04.077

Cited by 5 publications

(8 citation statements)

References 21 publications

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“…An existing set-up (Volkers et al 2004) designed for time-gated fluorescence spectroscopy of isotopologues of atmospheric interest (Volkers et al 2006) has been modified by implementing a supersonic plasma source. This plasma source has been used previously to study vibrationally excited radicals at low rotational temperatures (Bazalgette Courrèges-Lacoste et al 2001) and consists of a General Valve introducing a gas pulse in a multi-layer discharge geometry.…”

Section: Laboratory Experimentsmentioning

confidence: 99%

C₂emission features in the Red Rectangle

Wehres

Romanzin

Linnartz

et al. 2010

A&A

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Context. The Red Rectangle proto-planetary nebula (HD 44179) is known for a number of rather narrow emission features superimposed on a broad extended red emission (ERE) covering the 5000-7500 Å regime. The origin of these emission features is unknown. Aims. The aim of the present work is to search for potential carriers by combining new observational and laboratory data. This also allows to interpret spectral emission features in terms of actual physical conditions like temperature and density constraints and to trace chemical processes in the outflows of the Red Rectangle. Methods. Observational spectra have been obtained with the EMMI-NTT at offsets of 3 , 6 , 7 , 11 , 16 and 20 distance to the central star HD 44179. The spectra are compared to the outcome of a time-gated laser induced fluorescence laboratory study of an expanding acetylene plasma using a special supersonic pin-hole discharge source. With this set-up the hydrocarbon chemistry in the Red Rectangle nebula is simulated under laboratory controlled conditions. The plasma source has the unique feature to generate electronically and vibrationally excited species at low rotational temperatures. The comparison is facilitated by a simple model for fluorescent emission in the nebula. Results. Two of the astronomically observed narrow emission bands can be assigned as originating from unresolved rovibronic progressions within the d 3 Π g → a 3 Π u Swan system of the C 2 radical. The band appearance corresponds to a rotational temperature between 200 and 1000 K. The emission is driven by absorption in the C 2 Phillips bands followed by intersystem crossing from the singlet to the triplet state and pumping in the Swan bands. Conclusions. These observations imply an active (photo)chemistry in the ejecta of the Red Rectangle.

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Section: Laboratory Experimentsmentioning

confidence: 99%

C₂emission features in the Red Rectangle

Wehres

Romanzin

Linnartz

et al. 2010

A&A

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“…The experimental setup has been described in detail recently [22]. The second harmonic of a Nd:YAG laser is used to pump a tunable dye laser covering the frequency regime of 14 300-18 000 cm À1 (rhodamine 6G, sulforhodamine B, DCM, and pyridine 1) with a bandwidth of typically 0.07 cm À1 .…”

Section: Methodsmentioning

confidence: 99%

“…So far some infrared cell measurements have been reported [18][19][20][21] and spectroscopic observations in the visible range are largely lacking. The present work has been performed with a recently constructed spectroscopic setup optimized for minimal gas consumption, high sensitivity, and high spectral accuracy [22]. In this article more than 250 rovibronic bands of the A 2 B 2 -X 2 A 1 electronic system of 15 NO 2 are reported in the 555-700 nm range.…”

Section: Introductionmentioning

confidence: 99%

The A2B2–X2A1 electronic transition of 15NO2: A rovibronic survey covering 14300–18000cm−1

Volkers

Koudijzer

Vredenborg

et al. 2006

Journal of Molecular Spectroscopy

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“…The experimental setup has been described in detail recently [21]. The second harmonic of a Nd:YAG laser is used to pump a tunable dye laser covering the energy range of 11 800-14 380 cm À1 using Styryl 9, 8 and 7 dyes with a typical bandwidth of 0.07 cm À1 .…”

Section: Methodsmentioning

confidence: 99%

“…For the other isotopologues optical information is largely lacking, mainly because of problems related to the high costs involved in studying 15 N-and 18 O-isotopes. For this reason we have recently constructed a spectroscopic setup in which large frequency domains are scanned automatically with high sensitivity and high spectral accuracy at a minimal gas consumption [21]. In this way more than 250 rotationally resolved vibrational bands of the A 2 B 2 -X 2 A 1 electronic transition of the 16 O 15 N 16 O isotopologue have been observed in the 14 300-18 000 cm À1 range [1] and the present study is an extension of this work to the symmetric 18 O 14 N 18 O and asymmetric 16 O 14 N 18 O isotopologues in the 11 800-14 380 cm À1 range.…”

Section: Introductionmentioning

confidence: 99%