Collision-induced transfers

An Angular Momentum Model for Collision-Induced Transfer. 129... 

Fig. 5 Plot of rotational transfer rate coefficients for state-to-state collision-induced transfer in A(X) Li2 with Ne, Ar and Xe as collision partners from experiment (symbols) and via (5) (full line). Numerous other data sets on a wide range of molecules were found [36] to give fits of similar quality to (5)...

There are, as is to be expected, some striking similarities between the results of Chernoff and Rice and those of Parmenter and Tang. Consider the relative efficiencies of Nj collision-induced transfer from the level 6 of 52 benzene to other levels, and of Ar collision-induced transfer from the level 6a of 2 aniline to other levels. Parmenter and Tang find that the most efficient relaxation process in benzene is 6 - 6 l6 , which is endo-ergic by 237 cm- . The next most efficient process (down a factor of 2.5) is 6 - ll, 16 11 is nearly isoergic to 6 16 is 285 cm below 6 ). Collision-induced transitions from 6 to 0 , exoergic by 552 cm , and from 6 to 4 , 16, which are exoergic by 157 and 50 cm" , respectively, are... 

Orr B J and Smith I W M 1987 Collision-induced vibrational energy transfer in small polyatomic molecules J. Rhys. Chem. 91 6106-19... 

DGE a AC AMS APCI API AP-MALDI APPI ASAP BIRD c CAD CE CF CF-FAB Cl CID cw CZE Da DAPCI DART DC DE DESI DIOS DTIMS EC ECD El ELDI EM ESI ETD eV f FAB FAIMS FD FI FT FTICR two-dimensional gel electrophoresis atto, 10 18 alternating current accelerator mass spectrometry atmospheric pressure chemical ionization atmospheric pressure ionization atmospheric pressure matrix-assisted laser desorption/ionization atmospheric pressure photoionization atmospheric-pressure solids analysis probe blackbody infrared radiative dissociation centi, 10-2 collision-activated dissociation capillary electrophoresis continuous flow continuous flow fast atom bombardment chemical ionization collision-induced dissociation continuous wave capillary zone electrophoresis dalton desorption atmospheric pressure chemical ionization direct analysis in real time direct current delayed extraction desorption electrospray ionization desorption/ionization on silicon drift tube ion mobility spectrometry electrochromatography electron capture dissociation electron ionization electrospray-assisted laser desorption/ionization electron multiplier electrospray ionization electron transfer dissociation electron volt femto, 1CT15 fast atom bombardment field asymmetric waveform ion mobility spectrometry field desorption field ionization Fourier transform Fourier transform ion cyclotron resonance... 

Collision induced rotational energy transfer. A new scaling law probed by fs CARS... 

Of a special astronomical interest is the absorption due to pairs of H2 molecules which is an important opacity source in the atmospheres of various types of cool stars, such as late stars, low-mass stars, brown dwarfs, certain white dwarfs, population III stars, etc., and in the atmospheres of the outer planets. In short absorption of infrared or visible radiation by molecular complexes is important in dense, essentially neutral atmospheres composed of non-polar gases such as hydrogen. For a treatment of such atmospheres, the absorption of pairs like H-He, H2-He, H2-H2, etc., must be known. Furthermore, it has been pointed out that for technical applications, for example in gas-core nuclear rockets, a knowledge of induced spectra is required for estimates of heat transfer [307, 308]. The transport properties of gases at high temperatures depend on collisional induction. Collision-induced absorption may be an important loss mechanism in gas lasers. Non-linear interactions of a supermolecular nature become important at high laser powers, especially at high gas densities. 

New experimental measurements and theoretical analysis of the collision-induced absorption of N2-H2 pairs. J. Quant. Spectroscopy and Rad. Transfer, 95 489, 2005. 

FAB and LSIMS are matrix-mediated desorption techniques that use energetic particle bombardment to simultaneously ionize samples like carotenoids and transfer them to the gas phase for mass spectrometric analysis. Molecular ions and/or protonated molecules are usually abundant and fragmentation is minimal. Tandem mass spectrometry with collision-induced dissociation (CID) may be used to produce abundant structurally significant fragment ions from molecular ion precursors (formed using FAB or any suitable ionization technique) for additional characterization and identification of chlorophylls and their derivatives. Continuous-flow FAB/LSIMS may be interfaced to an HPLC system for high-throughput flow-injection analysis or on-line LC/MS. 

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