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P.L. Lijnse 《Journal of Quantitative Spectroscopy & Radiative Transfer》1974,14(12):1195-1198
Doublet mixing cross sections for K(42P)-Ar and He and for Rb(52P)-He collisions have been measured, in flames at 1720 K. The ratio σ12/σ21 was measured separately and was found to agree within 2 per cent with predictions derived from detailed balance. The experiments are compared with available semiclassical theoretical results. 相似文献
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P.L. Lijnse P.J.Th. Zeegers C.Th.J. Alkemade 《Journal of Quantitative Spectroscopy & Radiative Transfer》1973,13(10):1033-1045
Weighted average quenching cross sections for the Rb(52P) doublet by N2 and H2O were determined in flames with temperatures ranging from 1500 to 2500 K by measuring the fluorescence efficiency. The values found are and over the entire temperature range. At a temperature of 1720 K, mixing cross sections were obtained for the same doublet with N2, H2, O2 and H2O molecules. The cross sections found are: , ; , , , . The ratios σ12/σ21 were measured independently and were found to agree with the detailed- balance condition within 3 per cent. A critical comparison of the flame values with previous literature data on N2-cross sections shows that both mixing and quenching cross sections are temperature dependent in the range from 300 to 2500 K. 相似文献
3.
P.L. Lijnse 《Chemical physics letters》1973,18(1):73-76
By inclusion of an attractive part of the interaction potential into the ionic curve-crossing model theory for the quenching of the Na-D-doublet by nitrogen molecules, the discrepancy between theory and experiments may be removed. 相似文献
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P.L. Lijnse 《Journal of Quantitative Spectroscopy & Radiative Transfer》1974,14(11):1143-1155
The experimental temperature dependence of alkali-N2 quenching cross sections is explained semi-quantitatively by a simple theoretical model, based on an ionic intermediate state, in which attractive van-der-Waals forces play an essential role. Using this model, quenching experiments are compared with Na(32P)-N2 excitation measurements in molecular beams. From this comparison it is concluded that the distribution of relative cross sections for specific vibrational transitions during the quenching process can be described by a distribution calculated by Fisher,(8) whereas the distribution given by Bjerre(18) has to be rejected. Resonant vibrational-electronic energy transfer is not important. 相似文献
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Tj. Hollander P.L. Lijnse B.J. Jansen L.P.L. Franken 《Journal of Quantitative Spectroscopy & Radiative Transfer》1973,13(7):669-671
The efficiency of resonance fluorescence, Y, of the strontium resonance line (1P1→1S0 transition) at 4607.33 Å was measured in CO/N2O, CO/O2/Ar, and H2/O2/CO2/N2 flames at atmospheric pressure. From these data, the specific quenching cross sections, σqu, for CO2 and CO were found to be (60 ± 10) Å2 and (300 ± 60) Å2, respectively. The experimental cross sections were confronted with the intermediate ionic-state curve-crossing model and chemical quenching model, respectively. 相似文献
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P.L. Lijnse J.C. Hornman 《Journal of Quantitative Spectroscopy & Radiative Transfer》1974,14(10):1079-1083
Weighted average cross sections for quenching of the K(42P)-doublet by N2, H2, O2 and H2O, measured in flames, show no significant temperature dependence in the range from 1500 to 2500K. Doublet mixing cross sections for K(42P?42P) transitions were measured at 1720K for N2, O2, H2O. The ratios of both mixing cross sections were measured independently and were found to agree with the detailed balance condition within 2 per cent. It is shown that an ionic intermediate-state model cannot explain the large magnitude of N2? mixing cross sections. 相似文献
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P.L. Lijnse Cj. van der Maas 《Journal of Quantitative Spectroscopy & Radiative Transfer》1973,13(8):741-746
Effective cross sections for quenching of the Na(32P)-doublet by H2 and O2 molecules have been measured in flames in the temperature range 1500–2500 K. The H2-cross section decreases from (9.3±1.0) Å2 at 1500 K to (6.8±1.0) Å2 at 2500 K. The O2-cross section decreases from (39±2) Å2 at 1720 K to (31±2) Å2 at 2500 K. A critical comparison of the flame values with previous literature data on the H2-cross section at lower temperatures shows that it decreases systematically when the temperature rises from about 400 to 2500 K. 相似文献
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