Flowing afterglow method

Since the flowing-afterglow method is quite well established, a brief review of the basic features of this technique should be sufficient. The experiments of Gougousi et al.46 on H3 recombination and those of Adams et al.18 and of Smith and Spanel24 used nearly the same experimental method, but there are significant differences in the data analysis and in the interpretation of the results. 

Tandem mass spectrometry H6,i46) both stationary 116> and flowing afterglow-methods 118,147) and drift tube techniques U6> have also been applied to some of the clustering reactions. Results for the gas-phase solvation of H+ by H2O and NH3 generally agree well with the values obtained by high pressure mass spectro-metric observations 148). 

Flowing Afterglow Methods for Studying Formation and Reactions of... 

II. FLOWING AFTERGLOW METHODS FOR STUDYING FORMATION AND REACTIONS OF SMALL RARE GAS CLUSTER IONS... 

Electron attachment ionization should also be mentioned here. In this case, the goal is to deposit an electron on the neutral Y to produce the anion Y . When compounds have appreciable electron affinity, this can be accomplished easily by using an electron beam set at a very low potential (a few volts), allowing electron capture by the neutral molecule in the source. The flowing afterglow method can be applied to study the dynamics for organometallic ion-molecule reactions, particularly for anions. 

R.C. Bolden, R.S. Hemsworth, M.J. Shaw, and N.D. Twiddy, The measurement of penning ionization cross sections for helium 2 S metastables using a steady-state flowing afterglow method, J. Phys. R. 3, 61-71 (1970). 

Poutsma JC, Seburg RA, Chyall LJ, Sunderlin LS, Hill BT, Hu J, Squires RR. Combining electrospray ionization and the flowing afterglow method. Rapid Commun Mass Spectrom. 1997 11 489-93. 

The experimental vibrational distributions for HBr and HI were taken from ref. 60a, which used the flowing-afterglow method. The rotational distributions were taken from ref. 60b which used the arrested relaxation technique. The vibrational distribution from the latter are shifted slightly to high V levels and increased to 0.63 and 0.65, for HBr and HI, respectively. The vibrational and rotational distributions from HCl were taken from refs. 36 and 59, respectively Tamagake and Setser find = 0.57 and = 0.15. 

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