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Röpcke, J.; Mechold, L.; Käning, M.; Fan, Wai Yip; Davies, Paul B.

doi:10.1023/a:1021872420200

Cited by 54 publications

(76 citation statements)

References 36 publications

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“…Optimal values of the rovibronic levels for the triplet electronic states corresponding to principle quantum numbers n = 2, 3 of the united atom are listed in table III. Radiative transitions between those levels are located in visible part of spectra, which is most convenient for spectroscopic studies of non-equilibrium gases and plasmas [4,5]. The expanded version of the table III including all 1050 optimal level values is presented in [46].…”

Section: Experimental Determination Of Wavenumbers For Questionabmentioning

confidence: 99%

“…The most interesting resonance singlet band systems are located in vacuum ultraviolet (VUV), while the triplet transitions are responsible for major part of light emission of ionized gases and plasma in near infrared, visible and near ultraviolet. They are often used for spectroscopic diagnostics of non-equilibrium plasmas [1,2,3,4,5,6]. Therefore, the triplet rovibronic levels and optical transitions between them were chosen as the object of the present research.…”

Section: Introductionmentioning

confidence: 99%

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Optimal values of rovibronic energy levels for triplet electronic states of molecular deuterium

Lavrov

Umrikhin

2008

J. Phys. B: At. Mol. Opt. Phys.

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Section: Experimental Determination Of Wavenumbers For Questionabmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal values of rovibronic energy levels for triplet electronic states of molecular deuterium

Lavrov

Umrikhin

2008

J. Phys. B: At. Mol. Opt. Phys.

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“…The reactor was equipped with multi pass cell optics (White cell) in order to increase the absorption length (figure 2). A mirror spacing of 1.5 m and 40 passes gave an effective absorption length of 60 m. Details on the experimental setup, data acquisition and data processing can be found elsewhere [6,17,18,21]. The pressure was kept constant at 1.5 mbar during the experiments.…”

Section: General Considerationsmentioning

confidence: 99%

“…TDLAS is increasingly being used in the spectral region between 3 and 20 µm for measuring the concentrations of free radicals, transient molecules and stable products in their electronic ground states. TDLAS can also be used to measure neutral gas temperatures [2] and to investigate dissociation processes of molecular low temperature plasmas [3][4][5][6]. The main applications of TDLAS until now have been for investigating molecules and radicals in fluorocarbon etching plasmas [2,5,7], in plasmas containing hydrocarbons [6, 8-14, 60,63] and nitrogen, hydrogen and oxygen [58,59,61,62].…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Diagnostic Studies of Molecular Plasmas Using Laser Absorption Techniques

Röpcke

Engeln

Schram

et al. 2010

Introduction to Complex Plasmas

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Abstract. Within the last decade mid infrared absorption spectroscopy between 3 and 20 µm, known as Infrared Laser Absorption Spectroscopy (IRLAS) and based on tuneable semiconductor lasers, namely lead salt diode lasers, often called tuneable diode lasers (TDL), and quantum cascade lasers (QCL) has progressed considerably as a powerful diagnostic technique for in situ studies of the fundamental physics and chemistry of molecular plasmas. The increasing interest in processing plasmas containing hydrocarbons, fluorocarbons, organosilicon and boron compounds has lead to further applications of IRLAS because most of these compounds and their decomposition products are infrared active. IRLAS provides a means of determining the absolute concentrations of the ground states of stable and transient molecular species, which is of particular importance for the investigation of reaction kinetics. Information about gas temperature and population densities can also be derived from IRLAS measurements. A variety of free radicals and molecular ions have been detected, especially using TDLs. Since plasmas with molecular feed gases are used in many applications such as thin film deposition, semiconductor processing, surface activation and cleaning, and materials and waste treatment, this has stimulated the adaptation of infrared spectroscopic techniques to industrial requirements. The recent development of QCLs offers an attractive new option for the monitoring and control of industrial plasma processes as well as for highly time-resolved studies on the kinetics of plasma processes. The aim of the present article is threefold: (i) to review recent achievements in our understanding of molecular phenomena in plasmas, (ii) to report on selected studies of the spectroscopic properties and kinetic behaviour of radicals, and (iii) to describe the current status of advanced instrumentation for TDLAS in the mid infrared.

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“…Refs. [9][10][11][12][13][14][15]. If the OES technique can be applied with standard laboratory equipment in the visible region of the spectrum it would be of importance for monitoring and the control of various hydrogen or hydrogen isotopes plasma assisted technologies.…”

Section: Introductionmentioning

confidence: 99%

Rotational and gas temperatures of molecular deuterium in a hollow cathode glow discharge

Majstorović¹,

Šišović²

2015

Journal of Research in Physics

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We report the results of optical emission spectroscopy measurements of rotational T rot and translational (gas) temperature of deuterium molecules. The light source was a low-voltage high-pressure hollow cathode (HC) glow discharge with titanium cathode operated in deuterium. The rotational temperature of excited electronic states of D 2 was determined from the intensity distribution in the rotational structure of Q-branches of the two Fulcher-α diagonal bands: [ν 0 = ν" = 2] and [ν 0 = ν" = 3]. The population of the excited energy levels, determined from relative line intensities, was used to derive the radial distributions of the temperature of the excited and the ground state of the deuterium molecule.

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Cited by 54 publications

References 36 publications

Optimal values of rovibronic energy levels for triplet electronic states of molecular deuterium

Optimal values of rovibronic energy levels for triplet electronic states of molecular deuterium

Kinetic and Diagnostic Studies of Molecular Plasmas Using Laser Absorption Techniques

Rotational and gas temperatures of molecular deuterium in a hollow cathode glow discharge

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