Absolute total cross sections for producing H+, H, e, N2+, and 02+ have been measured for H+ N, and H+02 collisions from 50-eV to 3-keV hydrogen-atom energy. The experimental techniques used, when combined with classical differential-scattering calculations, also allowed determinations of the absolute largeangle-scattering differential cross sections for H+ production. The experimental and theoretical procedures are reviewed, and the results are compared, where possible, with the data of other investigators.

Absolute cross sections for producing H+, H−, H+2, He+, and e− have been measured for fast hydrogen atom impact on H2 and He targets. The hydrogen atom energy ranged between 50 eV and 3.0 keV. For the H+H2 reaction, the dominant ion-formation process for hydrogen atom energies below 250 eV was found to be H−+H+2 production. For He targets, production of H+ dominated over the entire hydrogen atom energy range. The results are compared, where possible, with the data of other investigators and are discussed in terms of possible reaction mechanisms.

No abstract

No abstract

No abstract

Articles you may be interested inRovibrationally selected ion-molecule collision study using the molecular beam vacuum ultraviolet laser pulsed field ionization-photoion method: Charge transfer reaction of N2 +(X 2Σg +; v+ = 0-2; N + = 0-9) + Ar J. Chem. Phys. 137, 104202 (2012); 10.1063/1.4750248 Experimental study of the asymmetric charge transfer reaction between Ar+ ions and Fe atomsA selected-ion-flow-drift-tube study of charge transfer processes between atomic, molecular, and dimer ion projectiles and polyatomic molecules ethane, propane, and n-butane

Apparatus has been developed for producing a beam of fast hydrogen atoms having energies between 10 and 3000 eV. The procedure involves generation of a beam of hydrogen ions (H−), appropriate ion acceleration and trajectory definition, and ion neutralization by a photodetachment process. The magnitude of the resulting neutral atom flux can be determined to within an uncertainty of less than ±3% by a technique described. An atom beam intensity in excess of 1011 atoms/sec at 1000 eV is readily obtainable, with the intensities at other energies scaling approximately inversely with the primary ion velocity. The advantages of the method over other neutral beam formation procedures are discussed, and techniques allowing considerable enhancement of the beam intensity over that presently achieved are suggested.

Vibrational relaxation in water vapor has been observed using both ultrasonic velocity dispersion and absorption. The raw data were corrected for real-gas effects and for classical absorption. Results are compared with those of other investigators. Observed relaxation times appear much too short to be explained by a simple V-T process, and are interpreted in terms of a V-R transfer mechanism. Values of kVR range from about 1×108 sec−1 atm−1 at 374 K to 6×108 sec−1 atm−1 at 946 K.