Methyl radical measurement by cavity ring-down spectroscopy

Zalicki, P.; Ma, Yongjian; Zare, Richard N.; Wahl, E.H.; Dadamio, J.; Owano, T. G.; Kruger, C.H.

doi:10.1016/0009-2614(95)00046-7

Cited by 108 publications

(53 citation statements)

References 29 publications

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“…10 In the pulsed cavity ringdown technique, first developed by O'Keefe and Deacon in 1987 for the determination of mirror reflectivities, 11 11 Since our first application of the cavity ringdown technique to the study of pulsed molecular beams, 12 several other researchers have employed the technique for various purposes, including gas cell spectroscopy of HCN, 13,14 adaptation to kinetics studies, 15 the spectroscopy of OH in flames, 16 and the detection of CH 3 in a hot filament flow reactor. 17 The Berkeley Cavity Ringdown Laser Absorption Spectrometer and time-of-flight mass spectrometer ͑TOFMS͒ are diagrammed in Fig. 1.…”

Section: A Cavity Ringdown Laser Absorption Spectroscopy (Crlas)mentioning

confidence: 99%

Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled gold silicides

Scherer

Paul

Collier

et al. 1995

The Journal of Chemical Physics

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The cavity ringdown technique has been employed for the spectroscopic characterization of the AuSi molecule, which is generated in a pulsed supersonic laser vaporization plasma reactor. Fifteen rovibronic bands have been measured between 340 nm-390 nm, 8 of which have been analyzed to yield molecular properties for the X and D 2 ⌺ states of AuSi. This assignment is in disagreement with previous emission studies of AuSi, which had assigned the ground electronic state as a 2 ⌸ state. A time-of-flight mass spectrometer simultaneously monitors species produced in the molecular beam and has provided evidence for facile formation of polyatomic gold silicides. Comparison of AuSi with our recent results for CuSi and AgSi indicates regular bonding trends for the three coinage metal silicide diatoms.

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Section: A Cavity Ringdown Laser Absorption Spectroscopy (Crlas)mentioning

confidence: 99%

Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled gold silicides

Scherer

Paul

Collier

et al. 1995

The Journal of Chemical Physics

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“…Use of CRD for sensitive absorption measurements with pulsed lasers was first demonstrated by O'Keefe and Deacon in 1988 [ 1] . Since then this technique has been used for absorption measurements on molecules in pulsed molecular beams [2][3][4][5], fortrace gas detection of molecules in ambient air and/ or in hostile environments [6][7][8] and for the measurement of absolute oscillator strengtbs of weak transitionsof stabie molecules [ 9,10], to ju st name a few. The CRD technique has been applied over the 200-3500 nm range [ 8,11] and a broadband version of this technique, that is prornising for exploration in the spectroscopically valuable IR region of the spectrum, has recently been demonstrated [ 12] .…”

Section: Introduetionmentioning

confidence: 99%

Phase shift cavity ring down absorption spectroscopy

Engeln

Helden

Berden

et al. 1996

Chemical Physics Letters

177

122

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Cavity ring down absorption spectroscopy with a continuous light souree is used to measure the transition frequencies and absolute absorption coefficient of the weak b 1 ItCv' = 2) +---X 3 I;-Cv" = 0) transition of 18 02. The absorption spectrum is extracted from a measurement of the magnitude of the phase shift that an intensity modulated continuous light beam experiences upon passing through an unstabilized optica! cavity.

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“…Based on the re-measured absorption cross section of Davidson et al [53] Cappelli and co-workers used the method of broadband ultraviolet absorption at 216 nm for quantitative detection of the methyl radical in plasmas of a supersonic arc jet [54] and in a microwave bell jar reactor [55], both utilized for diamond deposition (comp. also [56][57][58]). For the classical absorption measurements in the ultraviolet spectral range a deuterium lamp as light source and a monochromator of medium spectral resolution, have been applied, combined (i) with an optical multi-channel analyser as detector (method 1), or (ii) employing chopper modulation and a photo multiplier detector together with a lock-in amplifier (method 2).…”

Section: Measurements By Uv Absorptionmentioning

confidence: 91%

On the Reaction Kinetics of Chemically Active Molecular Microwave Plasmas

Stancu

Pipa

Lombardi

et al. 2005

Contrib. Plasma Phys.

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Key words Microwave plasmas, reaction kinetics, degree of dissociation, hydrogen, methyl radical, quantum cascade laser, boron monoxide. PACS 52. 20, 52.25, 52.75, 52.80 Recent studies of phenomena in molecular non-equilibrium microwave plasmas, which have been performed within the framework of the DFG-Sonderforschungsbereich 198, project A12, are presented in this review article. Special attention is devoted to the properties and kinetics of transient molecular species. The experimental methods used were optical emission and absorption spectroscopy. The main objectives of this contribution were threefold: (i) the determination of the degree of dissociation of hydrogen in plasmas, (ii) the quantitative detection of the methyl radical, and (iii) plasma process monitoring using quantum cascade lasers.

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Methyl radical measurement by cavity ring-down spectroscopy

Cited by 108 publications

References 29 publications

Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled gold silicides

Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled gold silicides

Phase shift cavity ring down absorption spectroscopy

On the Reaction Kinetics of Chemically Active Molecular Microwave Plasmas

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