Spectroscopy of jet-cooled ions and radicals

Engelking, P. C.

doi:10.1021/cr00003a006

Cited by 72 publications

(32 citation statements)

References 95 publications

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“…This has been a topic of intense interest in its own right, as supersonic expansions have widely enabled spectroscopic and dynamical studies in modern chemical physics. 100,101 Fluorescence from electronically excited ions created via electron impact is a simple means of obtaining rotationally resolved data and it was hoped that an electron impact probe could be used to evaluate the rotational distribution of the neutral target gas expanded in the supersonic expansion. 86 However, relating the rotational distributions of the ions formed via electron impact with the nascent neutral rotational distributions required unsubstantiated assumptions regarding the rotational excitation that occurs in the ionization step.…”

Section: Implications For Electron Beam Diagnostics Of Supersonic mentioning

confidence: 99%

Photoion rotational distributions from near-threshold to deep in the continuum

Poliakoff

Choi

Rao

et al. 1995

The Journal of Chemical Physics

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We present the first measurements of ion rotational distributions for photoionization over an extended range ͓0рE K р200 eV for N 2 ͑2 u Ϫ1 ͒ and 3рE K р125 eV for CO ͑4 Ϫ1 ͔͒. The N 2 ion rotational distributions are seen to change dramatically over this energy range, indicating that characteristically molecular behavior of the photoelectron persists far from ionization threshold. In addition, the N 2 and CO results show a strikingly different dependence on energy. Although differences are expected due to the absence of a center of symmetry in CO, detailed calculations reveal that this behavior arises from the presence of Cooper minima in the 2 u →k g continuum in the case of N 2 and from an f -wave shape resonance in the 4 →k channel in CO. Agreement between measured and calculated ion rotational distributions is excellent. The N 2 results are also compared with electron bombardment ionization data. This comparison demonstrates that previous interpretations of electron bombardment data are prone to errors.

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Section: Implications For Electron Beam Diagnostics Of Supersonic mentioning

confidence: 99%

Photoion rotational distributions from near-threshold to deep in the continuum

Poliakoff

Choi

Rao

et al. 1995

The Journal of Chemical Physics

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“…Plasma jet expansions have been used as a powerful technique for high resolution spectroscopy of molecular transients [1][2][3][4][5]. In recent years rotationally resolved spectra have been recorded for a number of radical and ionic species, combining plasma expansion techniques and sensitive spectroscopic detection techniques, such as LIF [1], REMPI-TOF [2], REMPI-PES [3], photo-detachment [4] and vibrational predissociation [5] spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years rotationally resolved spectra have been recorded for a number of radical and ionic species, combining plasma expansion techniques and sensitive spectroscopic detection techniques, such as LIF [1], REMPI-TOF [2], REMPI-PES [3], photo-detachment [4] and vibrational predissociation [5] spectroscopy. In the case of direct absorption experiments planar plasma expansions, i.e., expansions through a long and narrow slit, have turned out to be particularly useful.…”

Section: Introductionmentioning

confidence: 99%

Mass spectrometric and laser spectroscopic characterization of a supersonic planar plasma expansion

Witkowicz

Linnartz

Lange

et al. 2004

International Journal of Mass Spectrometry

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A mass spectrometric and laser spectroscopic experiment has been performed to characterize reactive species that are formed in a supersonic planar plasma expansion generated by discharging a high-pressure gas pulse in a multi-layer slit nozzle geometry. Discharges through mixtures of nitrogen, water and acetylene in He have been studied. The mass spectrometric study uses a state-of-the-art time-of-flight setup. Besides (cluster) cations, with sizes as large as (H 2 O) 56 H + , a variety of pure carbon chain anions has been observed. The spectroscopic study uses cavity ring down spectroscopy and shows that a planar plasma is also suited to obtain rotationally resolved spectra of vibrationally excited metastable electronic states.

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“…Historically, some of the most powerful tools for obtaining information on free radicals have been spectroscopic methods. 6 However, the transient and reactive nature of free radicals has often made their study extremely challenging to experimental spectroscopists. Free radicals are usually dif®cult to produce in high enough concentrations to allow spectroscopic investigation using routine laboratory instruments, such as standard IR or UV/VIS spectrometers.…”

Section: Introductionmentioning

confidence: 99%

Production and detection of short-lived metal-containing molecules in the gas phase: a review

Beardah

Ellis

1999

J. Chem. Technol. Biotechnol.

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The combination of laser ablation with laser-induced¯uorescence (LIF) spectroscopy for the study of short-lived metal-containing molecules in the gas phase is reviewed. Results for two free radicals derived from the alkaline-earth metals, MgCCH and BaOH, have been chosen to illustrate these experiments. The information available from vibrationally-resolved LIF studies of these molecules is described and the prospects for future work on metal-containing species is discussed.

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Spectroscopy of jet-cooled ions and radicals

Cited by 72 publications

References 95 publications

Photoion rotational distributions from near-threshold to deep in the continuum

Photoion rotational distributions from near-threshold to deep in the continuum

Mass spectrometric and laser spectroscopic characterization of a supersonic planar plasma expansion

Production and detection of short-lived metal-containing molecules in the gas phase: a review

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