Quenching of Na(3p2P) atoms by N2 and CO molecules at low temperatures

Quenching cross sections of Na(3 2P) by N2 and CO molecules at temperatures below 400 K have been measured by studying the dependence of the 3 2P lifetime on gas pressure. An original pulsed laser configuration has been employed to excite Na atoms. Lifetimes have been measured by the delayed coincidence method. From comparison of the present result with previous ones a linear dependence of quenching cross section on reciprocal mean kinetic energy can be inferred.

[1]  C. Sukumar,et al.  Quenching of excited atoms by collisions with stable molecules , 1977 .

[2]  F. H. Read,et al.  The measurement of lifetimes in atoms, molecules and ions , 1977 .

[3]  J. Barker.  A modified model for quenching and electronic—vibrational energy transfer , 1976 .

[4]  A. Schawlow,et al.  Absolute measurement of very low sodium-vapor densities using laser resonance fluorescence* , 1975 .

[5]  P. Lijnse.  Temperature dependence of the quenching of the Na-D-doublet by nitrogen molecules , 1973 .

[6]  R. J. Elsenaar,et al.  The temperature dependence of the quenching of Na-D-doublet by N2 and H2O in flames of 1500–2500 K , 1972 .

[7]  F. Strumia,et al.  Measurement of Sodium-Vapor Density at Very Low Pressures by an Optical Method* , 1971 .

[8]  E. R. Fisher,et al.  Vibration-electronic coupling in the quenching of electronically excited alkali atoms by diatomics. , 1971, Applied optics.

[9]  L. Krause,et al.  Inelastic collisions between excited alkali atoms and molecules. VII. Sensitized fluorescence and quenching in mixtures of rubidium with H2, HD, D2, N2, CH4, CD4, C2H4, and C2.H6 , 1970 .

[10]  B. Brosa,et al.  Bestimmung von Löschquerschnitten durch Lebensdauermessungen am Natrium-32P-Zustand , 1969 .

[11]  P. Lijnse,et al.  The relationship between the fluorescence yield and the underpopulation of doublet excited states , 1969 .

[12]  E. R. Fisher,et al.  DE-EXCITATION OF ELECTRONICALLY EXCITED SODIUM BY NITROGEN AND SOME OTHER DIATOMIC MOLECULES. , 1969 .

[13]  L. Krause,et al.  Inelastic collisions between excited alkali atoms and molecules. V. Sensitized fluorescence in mixtures of sodium with N2, H2, HD, and D2 , 1968 .

[14]  L. Krause,et al.  INELASTIC COLLISIONS BETWEEN EXCITED ALKALI ATOMS AND MOLECULES. III. SENSITIZED FLUORESCENCE AND QUENCHING IN MIXTURES OF POTASSIUM WITH N$sub 2$, H$sub 2$, HD, AND D . , 1968 .

[15]  L. Krause,et al.  Inelastic collisions between excited alkali atoms and molecules, III. Sensitized fluorescence and quenching in mixtures of potassium with N2, H2, HD, and D2 , 1968 .

[16]  L. Krause,et al.  INELASTIC COLLISIONS BETWEEN EXCITED ALKALI ATOMS AND MOLECULES. II. THE QUENCHING OF SODIUM RESONANCE RADIATION BY N$sub 2$, H$sub 2$, HD, AND D . , 1967 .

[17]  L. Krause,et al.  Inelastic Collisions between Excited Alkali Atoms and Molecules. I. Sensitized Fluorescence and Quenching in Cs-N2and Cs-H2Systems , 1967 .

[18]  L. Krause,et al.  The effect of imprisonment of radiation in sodium vapor on the measured lifetimes of the 3(2)P states. , 1967 .

[19]  D. R. Jenkins.  The determination of cross sections for the quenching of resonance radiation of metal atoms I. Experimental method and results for sodium , 1966, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[20]  W. Demtröder.  Bestimmung von Oszillatorenstärken durch Lebensdauermessungen der ersten angeregten Niveaus für die Elemente Ga, Al, Mg, Tl und Na , 1962 .

[21]  R. Norrish,et al.  The quenching of the resonance radiation of sodium , 1940, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[22]  Allan C. G. Mitchell,et al.  Resonance radiation and excited atoms , 1934 .