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Gas phase atomic and molecular proce...

Zhu, Cheng.

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Gas phase atomic and molecular processes.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Gas phase atomic and molecular processes./
作者:	Zhu, Cheng.
面頁冊數:	115 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2639.
Contained By:	Dissertation Abstracts International66-05B.
標題:	Physics, Atomic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3174090
ISBN:	0542120399

Gas phase atomic and molecular processes.
Zhu, Cheng.

Gas phase atomic and molecular processes. - 115 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2639.

Thesis (Ph.D.)--Harvard University, 2005.

We perform fully quantum mechanical calculations of the lithium 2p-2s and sodium 3p-3 s resonance lines pressure broadened by collisions with helium atoms. Using carefully constructed potential energy surfaces and transition dipole moments, we have obtained the emission and absorption coefficients at temperatures from 200 to 3000 K at wavelengths between 500 and 1000 nm for lithium and at temperatures from 158 to 3000 K at wavelengths between 500 and 760 nm for sodium. Contributions from quasi-bound levels are included. Our results are in good agreement with experiment. These broadened line profiles are important in developing effective diagnostics on the temperatures, densities, albedos and composition of the atmospheres of brown dwarfs and extrasolar giant planets. We compute the diffusion coefficients of ground and excited-state lithium and sodium atoms in a helium gas. They are valuable in predicting the sign and magnitude of the light-induced drift for the gas mixture. We calculate the dispersion coefficients of the long range interactions of alkali-metal atoms with molecular hydrogen and helium atoms. The uncertainties in our results are less than 2%. We study the relaxation of the v = 1 vibrational level of carbon monoxide induced by collisions with helium three atoms in ultracold temperatures. We confirm the Wigner's threshold law which states that in the zero temperature limit the inelastic quenching cross sections are inversely proportional to the velocity of the incident atom. Our calculations agree well with experiment and we find enhanced rate coefficients as compared to those for 4He-CO. We study the chemistry of hydrogen fluoride in the interstellar medium. We consider fine-structure collisions and find that most fluorine atoms reside in the ground 2P3/2 state. We calculate the rate coefficients for the reaction of F(2P 3/2) atoms in collisions with H2. Our results agree well with experiment. We confirm the conclusions of Neufeld et al. that in interstellar clouds HF is the major form of gas phase fluorine.

ISBN: 0542120399Subjects--Topical Terms:

1029235
Physics, Atomic.

Gas phase atomic and molecular processes.
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520 $a We perform fully quantum mechanical calculations of the lithium 2p-2s and sodium 3p-3 s resonance lines pressure broadened by collisions with helium atoms. Using carefully constructed potential energy surfaces and transition dipole moments, we have obtained the emission and absorption coefficients at temperatures from 200 to 3000 K at wavelengths between 500 and 1000 nm for lithium and at temperatures from 158 to 3000 K at wavelengths between 500 and 760 nm for sodium. Contributions from quasi-bound levels are included. Our results are in good agreement with experiment. These broadened line profiles are important in developing effective diagnostics on the temperatures, densities, albedos and composition of the atmospheres of brown dwarfs and extrasolar giant planets. We compute the diffusion coefficients of ground and excited-state lithium and sodium atoms in a helium gas. They are valuable in predicting the sign and magnitude of the light-induced drift for the gas mixture. We calculate the dispersion coefficients of the long range interactions of alkali-metal atoms with molecular hydrogen and helium atoms. The uncertainties in our results are less than 2%. We study the relaxation of the v = 1 vibrational level of carbon monoxide induced by collisions with helium three atoms in ultracold temperatures. We confirm the Wigner's threshold law which states that in the zero temperature limit the inelastic quenching cross sections are inversely proportional to the velocity of the incident atom. Our calculations agree well with experiment and we find enhanced rate coefficients as compared to those for 4He-CO. We study the chemistry of hydrogen fluoride in the interstellar medium. We consider fine-structure collisions and find that most fluorine atoms reside in the ground 2P3/2 state. We calculate the rate coefficients for the reaction of F(2P 3/2) atoms in collisions with H2. Our results agree well with experiment. We confirm the conclusions of Neufeld et al. that in interstellar clouds HF is the major form of gas phase fluorine.
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