Molecular beam time of flight measurements of resolved rotational transitions for He+N2, CO, and CH4 collisions

Abstract

Articles you may be interested inTimeofflight measurements of the rotational excitation of para and orthoH2 by collisions with Li+ ions. I. Angular dependent transition probabilities for the j=0→2, 2→0, 2→4, and 1→3 transitions at E c.m.=0.6 eV J. Chem. Phys. 71, 3770 (1979); 10.1063/1.438784 Molecular beam measurements of inelastic cross sections for transitions between defined rotational states (j,m) of CsF in collisions with He, Low energy ionizing collisions between N2 and CO beam molecules and CO, N2, NO, CH4, and CO2 target molecules J. Chem. Phys. 68, 2742 (1978); 10.1063/1.436065 Resolved singlequantum rotational excitation in HD+He collisions: First results from a unique pulsed molecular beam apparatus

State to state He–CO rotationally inelastic scattering

“…We compare our experimental results with predictions of the two best available potential surfaces, the XC͑fit͒ potential of Le Roy et al and the new SAPT potential of Heijmen et al. The previous measurements most closely related to ours are the rotationally inelastic TOF spectra of Faubel et al 5 and the relative total T→R cross sections measured in crossed supersonic jets by Kruus. 22 Oscillatory structure in the postcollision rotational distributions is prominent in our results.…”

“…4 In 1980 Faubel et al published a time-of-flight spectrum of He scattered from CO at one laboratory angle that showed partial resolution of the CO rotationally inelastic transitions. 5 Transitions up to ⌬ jϭ3 were apparent at their collision energy of 27.3 meV. Around the same time Bassi et al studied rotational relaxation of CO in a free jet of He with infrared spectroscopy.…”

Ab initio potential energy surface, infrared spectrum, and second virial coefficient of the He–CO complex

“…~ The SAPT interaction en ergy is represented as a sum of components corresponding to the Hartree-Fock (ZsJJf) and correlated (Ec™) levels of the theory, E i n t = + Ec™ . The Hartree-Fock interaction energy can be decomposed as [12][13][14][15] r H F _ p( 10) , p( 10) , 77(20) 1 17(20) 1 £ /7 HF int ^pol ^exch ^ind.resp ^exch-ind.resp ^int »…”

“…The advantage of the expansion (15) is that it shows explicitly the anisotropy of the potential, the term with / = 0 being the isotropic potential. In order to establish the importance of various anisotropic terms at vari ous /?, we report in Fig.…”

Serendipitous Meanderings and Adventures With Molecular Beams

“…Several years later, with the high-speed-ratio He atom beam in another apparatus, which some claim is the largest of its kind, and using time-of-flight spectroscopy, Faubel was able to resolve the quantized rotational energy losses for collisions of He atoms with O 2 , N 2 , CO, and CH 4 (34). In our earlier experiments, we had resolved rotational transitions in H 2 using Li + -ions.…”