ANGULAR-MOMENTUM REORIENTATION IN CO(A1-PI)-HE ROTATIONAL ENERGY-TRANSFER STUDIED BY OPTICAL OPTICAL DOUBLE-RESONANCE MULTIPHOTON IONIZATION SPECTROSCOPY

	ANGULAR-MOMENTUM REORIENTATION IN CO(A1-PI)-HE ROTATIONAL ENERGY-TRANSFER STUDIED BY OPTICAL OPTICAL DOUBLE-RESONANCE MULTIPHOTON IONIZATION SPECTROSCOPY
	SHA, GH; SUN, WZ; BO, J; HINTSA, E; ZHANG, CH
刊名	JOURNAL OF CHEMICAL PHYSICS
	1993-06-15
卷号	98 期号:12 页码:9487-9495
ISSN号	0021-9606
文献子类	Article
英文摘要	An optical-optical double resonance multiphoton ionization (OODR-MPI) technique has been developed for measuring the angular momentum reorientation in CO(A 1PI)-He inelastic thermal collisions. In this scheme, two-photon pumping of CO(A 1PI) by using a circularly polarized laser creates a highly anisotropic oriented angular momentum distribution in CO(A 1PI). A second counterpropagating circularly polarized laser probes the oriented CO (A 1 PI) via 1 + 1 photon resonance ionization. A depolarization factor (D), which can be calculated from the measured intensity ratios between R and P branches in the OODR-MPI spectrum, is introduced to characterize the amount of collisional reorientation in the J --> J' rotational energy transfer (RET). This method has the advantage of both high sensitivity and simplicity in data processing. The experimental results show the propensities that the depolarization factor D increases with DELTAJ but decreases with increasing initial J. The D's are asymmetric with respect to +/- DELTAJ. For comparison, theoretical D's have been computed by an irreducible tensor formalism under the infinite-order-sudden approximation by Alexander and Davis V. Chem. Phys. 78, 6754 (1983)] which is further simplified by using an exponential energy pp term to represent the dynamic effects. The computed curves of D vs DELTAJ/J reproduce the experimental propensities. The best fit between theory and experiment is obtained with an average impact parameter b = 2.9 angstrom, corresponding to a cross section of 26.4 angstrom2, Which is close to the experimental total cross section of CO(A 1PI)-He rotational energy transfer (approximately 28 angstrom2).
WOS关键词	M-PRESERVING PROPENSITIES ; INELASTIC-COLLISIONS ; MOLECULES ; DEPENDENCE ; CO
WOS研究方向	Physics
语种	英语
出版者	AMER INST PHYSICS
WOS记录号	WOS:A1993LG10100029
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/167734]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	SHA, GH
推荐引用方式 GB/T 7714	SHA, GH,SUN, WZ,BO, J,et al. ANGULAR-MOMENTUM REORIENTATION IN CO(A1-PI)-HE ROTATIONAL ENERGY-TRANSFER STUDIED BY OPTICAL OPTICAL DOUBLE-RESONANCE MULTIPHOTON IONIZATION SPECTROSCOPY[J]. JOURNAL OF CHEMICAL PHYSICS,1993,98(12):9487-9495.
APA	SHA, GH,SUN, WZ,BO, J,HINTSA, E,&ZHANG, CH.(1993).ANGULAR-MOMENTUM REORIENTATION IN CO(A1-PI)-HE ROTATIONAL ENERGY-TRANSFER STUDIED BY OPTICAL OPTICAL DOUBLE-RESONANCE MULTIPHOTON IONIZATION SPECTROSCOPY.JOURNAL OF CHEMICAL PHYSICS,98(12),9487-9495.
MLA	SHA, GH,et al."ANGULAR-MOMENTUM REORIENTATION IN CO(A1-PI)-HE ROTATIONAL ENERGY-TRANSFER STUDIED BY OPTICAL OPTICAL DOUBLE-RESONANCE MULTIPHOTON IONIZATION SPECTROSCOPY".JOURNAL OF CHEMICAL PHYSICS 98.12(1993):9487-9495.