Intensity and wavelength measurements for the CS+ (A2II−X2∑+) and CS(A1II−X1∑+) band systems excited by the reaction of metastable He(23S) with CS2

Coxon, John A.; Marcoux, P. J.; Setser, D. W.

doi:10.1016/s0301-0104(76)80004-3

Cited by 77 publications

(17 citation statements)

References 40 publications

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“…At our resolution and due to the large statistical error we cannot identify any structure. Thus, we are not able to decide whether it is the CS+(AZF/-X2~ +) emission found in this range after excitation of CS2 by He(2BS) as shown in [3,4] and Fig. 4c of the present paper.…”

Section: Fluorescence Spectracontrasting

confidence: 58%

“…This means that a CS~-ion formed in the /3 state with either 4 vibrational quanta of the symmetric stretching mode or with 6 quanta of the bending mode will still be stable. Franck-Condon transitions populate prefer- [15] b CS + (A 2H -X 2Z+) transition from [3] c CS+(B 2z~-A 2i/) transition from [4] a From [14] e S and S + excitation energies from [25] f CS excitation from [31] state must be considered to be stable unless the CS~-(/i) molecule contains more than 2.06 eV of vibrational energy. For the moment we state that the most likely source of these events is the formation of CS~-(/3) ions with more than 313 meV of vibrational energy.…”

Section: Electron-ion-coincidence Spectramentioning

confidence: 99%

“…5). Coxon et al [3] have measured this spectrum in a flowing afterglow experiment. They found the 2/r/1/2---+2~+ subbands to be always weaker than the corresponding 2//3/2---~2~:~+ sub-bands and ascribed this to thermal equilibration of the finestructure components during the lifetime of CS+(A2/7) of several gs.…”

Section: Fluorescence Spectramentioning

confidence: 99%

“…The reaction of metastable helium He(23S) and CS2 has been investigated before by means of electron spectroscopy [1,2] and in flowing afterglow by optical spectroscopy [3,4]. However, the existence of a second entrance channel He + +CS2-in addition to the covalent entrance channel He*+CSz has so far escaped attention even though it is responsible for the major part of all reactions.…”

Section: Introductionmentioning

confidence: 99%

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Excitation transfer from He(235,21,S) into bound and continuum states of CS2 studied by electron and optical spectroscopy and by coincidence measurements

et al. 1985

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For the reaction of He(23S, 21S) with CS2 we present a large body of experimental data: electron spectra, fluorescence spectra, electron-ion and electron-photon coincidence spectra. The combination of all these data allows us to characterize the reaction in great detail in a way which is rather direct and free of speculations. As for other molecules with positive electron affinity the charge exchanged channel He + + CS~ plays an important role as intermediate state. It is possible to isolate experimentally the electron energy spectra which correspond to formation of the individual electronic CS2 + states out of the intermediate He + +CS2 state. This has not been achieved so far for CS2 or any other molecule by straightforward evaluation of experimental data. L IntroductionThe reaction of metastable helium He(23S) and CS2 has been investigated before by means of electron spectroscopy [1,2] and in flowing afterglow by optical spectroscopy [3,4]. However, the existence of a second entrance channel He + +CS2-in addition to the covalent entrance channel He*+CSz has so far escaped attention even though it is responsible for the major part of all reactions. Since CS2 has a positive electron affinity of EA =0.54 eV [5] the importance of the configuration He + +CS~ is not surprising in view of the behaviour of other molecules with positive electron affinity like NO2, SO2, 02 and C12 [64].In this paper we present for the reaction of He(23S) and CS2 the improved electron energy spectrum and -measured in the same machine under the same conditions -the fluorescence spectrum from 1,800-8,800A. The same set of data was obtained for the first time for the other metastable species He(21S). For comparison we have in addition taken these data for impact of 584 A (HeI) photons. Further, for the system He(23S)+CS2, we have carried out two types of coincidence measurements. We have taken spectra of electrons which are coincident * Dedicated to Prof. O. Osberghaus on the occasion of his 65th birthday with either of the parent or fragment ions. On the other hand we have measured the spectrum of electrons which are emitted in coincidence with CSf(/? -J() emission around 284 nm. The paper is organized as follows: in Sect. II we describe briefly our experimental setup and in Sect. III we present our measured data and point out similarities and discrepancies to existing literature. In the following section we undertake the attempt to develop a picture of the He(23S, 21S)+C82 reactions which incorporates all experimentally observed features.

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Section: Fluorescence Spectracontrasting

confidence: 58%

Section: Electron-ion-coincidence Spectramentioning

confidence: 99%

Section: Fluorescence Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Excitation transfer from He(235,21,S) into bound and continuum states of CS2 studied by electron and optical spectroscopy and by coincidence measurements

et al. 1985

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“…Coxon et al (1976) first measured the CS + A 2 Å i YX 2 AE + system excited by the reaction of metastable He with CS 2 . The rotational analysis of observed electronic spectra of CS + has revealed that some vibrational levels of the A 2 Å i state, especially the v 0 = 1, v 0 = 5, and v 0 = 6 levels, are strongly perturbed by high vibrational levels of the X 2 AE + state.…”

Section: Introductionmentioning

confidence: 99%

The Submillimeter‐Wave Spectrum of the CS⁺Radical Ion

Bailleux¹,

Walters²,

Grigorová³

et al. 2008

ApJ

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The submillimeter-wave spectrum of the CS + radical cation in its ground electronic state (X 2 AE + ) has been observed for the first time, in a flowing positive column discharge in a CS 2 -Ar mixture partially cooled with a limited flow of liquid nitrogen. Nine rotational transition frequencies were recorded between 414 and 622 GHz, leading to the determination of accurate molecular constants B 0 = 25908.8560(41) MHz, D 0 = 41.344(18) kHz, and 0 = 597.629(41) MHz, which we use to predict transition frequencies up to the terahertz region in order to stimulate new attempts at astronomical detection.

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Transition Probabilities in theA1Π–X1Σ+System of CS

Mahon

Stampanoni

Luque

et al. 1997

Journal of Molecular Spectroscopy

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Intensity and wavelength measurements for the CS+ (A2II−X2∑+) and CS(A1II−X1∑+) band systems excited by the reaction of metastable He(23S) with CS2

Cited by 77 publications

References 40 publications

Excitation transfer from He(235,21,S) into bound and continuum states of CS2 studied by electron and optical spectroscopy and by coincidence measurements

Excitation transfer from He(235,21,S) into bound and continuum states of CS2 studied by electron and optical spectroscopy and by coincidence measurements

The Submillimeter‐Wave Spectrum of the CS⁺Radical Ion

Transition Probabilities in theA1Π–X1Σ+System of CS

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Intensity and wavelength measurements for the CS+ (A2II−X2∑+) and CS(A1II−X1∑+) band systems excited by the reaction of metastable He(23S) with CS2

Cited by 77 publications

References 40 publications

Excitation transfer from He(235,21,S) into bound and continuum states of CS2 studied by electron and optical spectroscopy and by coincidence measurements

Excitation transfer from He(235,21,S) into bound and continuum states of CS2 studied by electron and optical spectroscopy and by coincidence measurements

The Submillimeter‐Wave Spectrum of the CS+Radical Ion

Transition Probabilities in theA1Π–X1Σ+System of CS

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The Submillimeter‐Wave Spectrum of the CS⁺Radical Ion