Dissociation and vibrational excitation ofH2molecules and wall influence on the densities in a multicusp ion source

Hydrocarbon radicals interaction with amorphous carbon surfaces

“…Spectroscopic measurements of the vibrational states have been in made in TEX-TOR [19]. Also the distribution of the H 2 molecules within the many vibrational levels of the electronic ground state has been studied theoretically [20,21] and experimentally [22][23][24][25]. Equilibration of the molecule/radical at the desired incident energy poses the limit to which the molecules can be accelerated.…”

“…This approach represents the true physical picture as there are no means in the PSI-2 experiments to suppress the rotationalvibrational excitations. It is also known that the total energy gained by the molecules in the plasma would have translational, rotational and vibrational contributions [19][20][21][22][23][24][25]. Spectroscopic measurements of the vibrational states have been in made in TEX-TOR [19].…”

Enhanced production of negative ions in low-pressure hydrogen and deuterium pulsed discharges: Theoretical calculations

“…1(a) -1(d) a more complete picture of the relaxation of EEDF, of dissociative attachment rates, of vibrational distribution Nv, and of D concentration in the post discharge. The results we report have been obtained by applying our model to the experimental conditions (with the discharge on) discussed by Eenshuistra et al [5] (p=2.25 mtorr, discharge voltage 110 V, discharge current 10 A, discharge time 2.66 ms). Moreover, we refer to a D2 discharge since for this system our program contains a better set of electron vibration and dissociative attachment cross sections [6] (see also Ref.…”

The role of high Rydberg states in the generation of negative ions in negative-ion discharges

“…4 are plotted the negative ion concentrations as a function of discharge electron temperature taken from the FOM At the previous Symposium in this series the author reexperiment. 3 The error bars have been reported by Hopman. 7 8 ported the calculation of the ion density at KT=1.4eV, using the numerical negative ion code and assuming dissociative attachment to the vibrational levels, a d , belonging to the ground state.…”