H atom beams

Rettner C T 1994 Reaction of an H-atom beam with Cl/Au(111)—dynamics of concurrent Eley-Rideal and Langmuir-Hinshelwood mechanisms J. Chem. Phys. 101 1529... 

Fig. 3.9. Intensity profile I of H-atoms beam incident on the target. Beam pressure in the main chamber is 6.3xl0 5 Torr temperature of H-atoms generator pyrolysis filament is 1550 C.

Fig. 6. Doppler profile of H and D fragments from the photolysis of C2H2 and C2D2, respectively. The narrow doublet at the center is the Doppler profile of a supersonically-cooled H-atom beam.

H2 molecular beam. The H-atom products were detected by the Rydberg tagging TOF technique using the same scheme described in the last paragraph with a rotatable MCP detector. Figure 4 shows the experimental scheme of the crossed beam setup for the 0(1D) + H2 reactive scattering studies. The scheme used for the H + D2(HD) studies is very similar to that used in the 0(1D) + H2 except that the H-atom beam source is generated from HI photodissociation rather than the 0(1D)-atom beam source from 02 photodissociation. 

The experimental results show that all -products are more backward and sideway scattered relative to the H-atom beam direction. In addition... 

Results and Discussion. The experimental data for the reactions H - - T2 (Reaction 4) and D + T2 (Reaction 5) are shown in Figures 6 and 7, respectively data for Reaction 4 with the H-atom beam source... 

Which fraction of H atoms in the i S /2 ground state that can be excited by a Doppler-free two-photon transition into the 2 5 i/2 state in a collimated H atomic beam with T = 10 m/s, when a laser with 7 = 10 W/cm and a rectangular beam cross section of 1 x 1 mm crosses the atomic beam perpendicularly and the absorption probability is P// = (ao 7) /(y hv) where ao = 10" cm and y is the linewidth. 

The experimental realization is based on the comparison of the optical frequency comb with the Cs-atomic clock, which represents up to date the frequency standard. A dye laser at X = 486 nm is stabilized to a frequency vi which differs from the frequency Vc of one of the teeth of the optical frequency comb by the radiofrequency /i. The output of the dye laser is frequency doubled in a BBO-crystal and is then sent collinearly to the H-atom beam into an enhancement cavity, where it excites the two-photon transition 15 -> 25 of the H-atom [1326]. The radio-frequency... 

Fig. 3.24. Temperature dependent rate coefficients for the CHJ collision system. The reaction CHJ + H2 — CH + H has been reported by Asvany et ol. First results for the CH + H collision system have been presented on a conference. " The results depend critically on the energy distribution of the H-atom beam. A detailed analysis is in preparation. The dashed line predicts the rate coefficient as a function of the ion temperature, T22PT > for an hydrogen beam with 1 meV kinetic energy.

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