Recombination Spectrum and Electron Density Measurements in Neon Afterglows

Holt, R. B.; Richardson, John M.; Howland, B.; McClure, B. T.

doi:10.1103/physrev.77.239

Cited by 45 publications

(7 citation statements)

References 7 publications

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“…4 * 5,9 ' [12][13][14][15][16][17][18][19] Their published results are presented in Table I in a chronological order. From column 1 we observe that the numerical values of the neon recombination coefficients obtained at room temperature («300°K) are all in reasonable agreement, with the possible exception of the results of Holt et a/., 13 despite the fact that many of the results have not been corrected for the effects of diffusion. When proper corrections for diffusion effects are taken into account, 9 the spread in the experimental values becomes even less, most of the values being in the range 1.6X10 -7 to 1.9XlO-7 cm 3 /sec.…”

Section: Resultsmentioning

confidence: 99%

Study of the Pressure and Temperature Dependence of Electron-Ion Recombination in Neon

Kasner

1968

Phys. Rev.

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Conventional microwave and mass-spectrometric techniques have been used to study the loss rate of electrons and ions in the afterglow following microwave discharges in neon. Under the conditions of the experiment, the afterglow decay rate is controlled by the recombination of electrons with the only observed ion species, Ne 2 + , yielding a recombination coefficient which has a value of o;(Ne2 + )= (1.8=t0.2)X10~7 cm 3 /sec at 295°K and a temperature dependence of T^" -0 -45^0 -04 over the range covered, 295-503°K. At any given temperature, the measured recombination rates show no systematic dependence on the neon gas pressure over the range used, 8-30 Torr, indicating that the observed recombination process is a two-body reaction. Temporal mass analysis shows similar decay rates for the Ne 2 + ions and for the electrons over the major portion of the afterglow.

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Section: Resultsmentioning

confidence: 99%

Study of the Pressure and Temperature Dependence of Electron-Ion Recombination in Neon

Kasner

1968

Phys. Rev.

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“…From the vantage point of 60 years, it is clear that the prediction of Bates was based upon an incorrectly interpreted experiment. Another microwave discharge afterglow experiment [7] in Ne gas obtained a DR rate coefficient of 1.1 x 10 -7 cm 3 /sec. In this case, the inverse electron density was plotted over a much shorter time than in the He afterglow.…”

Section: The Beginningmentioning

confidence: 97%

Comments on developments in the theory of dissociative recombination over the past 60 years

Guberman¹

2011

J. Phys.: Conf. Ser.

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Since the proposal, sixty years ago, of the direct dissociative recombination (DR) mechanism by Bates, there have been many important theoretical advances, especially within the past 30 years. Space limitations preclude the review of all significant theoretical contributions. Instead, I comment upon a few selected developments. Highlights of the early scattering theory of DR and of the powerful Multichannel Quantum Defect Theory (MQDT) are discussed. Enhancements to the latter approach have included the addition of second and all order K matrices, ion rotational motion, Rydberg states with excited cores and spin-orbit coupling between Rydberg states. Also discussed are DR by Born-Oppenheimer breakdown, angular product distributions in diatomic DR and oscillations in DR cross sections.

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“…22, the diffusion loss of the electrons and ions to the walls of the container will be small compared to the loss by volume recombination. Langmuir probe 24 or microwave 23,40 techniques have been used to measure the decay of electron density from an initially ionized gas. The probe measurement requires that the mean free path greatly exceeds the probe dimension, so it is essential that the gas pressure should be below about 1 torr.…”

Section: Afterglow Processesmentioning

confidence: 99%

A spectroscopic investigation of the afterglow and recombination process in a microsecond pulsed glow discharge

Yan

Lin

Huang

et al. 2010

J. Anal. At. Spectrom.

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The emission characteristics of afterglow in a microsecond pulsed glow discharge atomic source are studied to obtain insight into the excitation and recombination processes of analytes and fill gases. Each emission line features an initial intense peak at the beginning of the discharge pulse. The afterglow, which has been observed in the temporal behavior for some emission temporal profiles of analytes and discharge gases, exhibits an intense post-pulse signal maximized at 25-35 mu s after plasma termination, with a broader profile than their initial peaks. The afterglow of Ar I and Cu I spectra last approximately 100 mu s and 300 mu s, respectively, after the argon discharge pulse at 2.0 torr pressure. The intensity of the afterpeak increases with the pulse width between 2 mu s to 200 mu s. A study of fourteen Ar I and twenty-seven Cu I lines show that transitions from high energy levels (5p[ 14.5-14.7 eV] for Ar and above 6 eV for Cu) are relatively stronger in the afterglow. The highly excited argon and copper atoms are thought to be generated via the recombination of ions and electrons. The results are explained primarily in terms of an electron-electron-ion three-body recombination process.Department of Energy, Basic Energy Sciences ; National Natural Science Foundation of Chin

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Recombination Spectrum and Electron Density Measurements in Neon Afterglows

Cited by 45 publications

References 7 publications

Study of the Pressure and Temperature Dependence of Electron-Ion Recombination in Neon

Study of the Pressure and Temperature Dependence of Electron-Ion Recombination in Neon

Comments on developments in the theory of dissociative recombination over the past 60 years

A spectroscopic investigation of the afterglow and recombination process in a microsecond pulsed glow discharge

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