| Original Articles |
|
|
|
|
Density Distributions of H and H2 in Pulsed Microwave Hydrogen Plasmas |
| DUAN Xu-Ru1;H. Lange2;QIAN Shang-Jie1;N. Lang2 |
| 1Southwestern Institute of Physics, PO Box 432, Chengdu 610041
2Institute of Low Temperature Plasma Physics, Greifswald 17489, Germany |
|
| Cite this article: |
|
DUAN Xu-Ru, H. Lange, QIAN Shang-Jie et al 2003 Chin. Phys. Lett. 20 489-492 |
|
|
|
Abstract Temporal distribution of the H atom and H2 densities in a pulsed microwave hydrogen plasmas has been measured simultaneously by two-photon absorption laser-induced fluorescence (TALIF). The measurement of the H-atom absolute density obtained by NO2 titration in a flow tube reactor shows that the density of H2 could be determined by the measured effective lifetime of the TALIF signal via the quenching equation. The H-atom density of about 1.5 x 1015cm-3 in both pulsed and stationary phases does not obviously change. It is found that the gas temperature volume effect plays an important role in governing the distributions of the H-atom density and it is mole fraction. The calculated gas temperature is in good consistent with the rotational temperature of H2 measured by optical emission spectroscopy in pulsed phase.
|
| Keywords:
52.70.-m
52.20.-j
31.70.Hq
32.50.+d
33.50.Dq
|
|
|
Published: 01 April 2003
|
|
| PACS: |
52.70.-m
|
(Plasma diagnostic techniques and instrumentation)
|
| |
52.20.-j
|
(Elementary processes in plasmas)
|
| |
31.70.Hq
|
(Time-dependent phenomena: excitation and relaxation processes, and reaction rates)
|
| |
32.50.+d
|
(Fluorescence, phosphorescence (including quenching))
|
| |
33.50.Dq
|
(Fluorescence and phosphorescence spectra)
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
