Electron transfer in collisions of keV hydrogen atoms and ions with methane

Abstract

Absolute differential cross sections are reported for electron capture and loss by 1–5 keV H atoms incident on CH4 for laboratory scattering angles up to 1.62°, and for charge transfer of 0.5–5 keV H+ with CH4 for scattering angles up to 2.09°. Electron-loss collisions are seen to result in comparatively large scattering angles and a very clear similarity exists between the present differential cross sections and those reported for other molecular targets. The present charge-transfer differential cross sections are consistent with that of Gao et al (1990 Phys. Rev. A 41 5929–33) but not with the calculations of Kimura et al (1995 Phys. Rev. A 52 1196–205). Prior experimental studies of electron-loss and charge-transfer are generally in good accord with the integral values reported here as are the calculations of Kusakabe et al (2000 Phys. Rev. A 62 062715).

Experimental determination of the energy dependence of the rate of the muon transfer reaction from muonic hydrogen to oxygen for collision energies up to 0.1 eV

“…2, left, we plot the values λ i calculated in this way and, for comparison, the solution obtained with n T = 3 and n G = 20. Solutions with n G > n d are not positive definite due to the underdeterminedness of (7). Note that the calculations provide only the approximate values of λ pO (E) at the energies E i , i = 1, ..., n G , of which only a few are within the interval of main interest 0 ≤ E ≤ 0.1 eV; the connecting dashed straight lines serve to distinguish the solutions but do not carry any information about the behavior of λ pO (E) between the nodes E i .…”

“…TABLE II: Values of λ i = λ pO (E i ) and δ st λ i (in units 10 10 s −1 ) for node energies E i < 0.2 eV, calculated from (7) for n G = 10 using TSVD and Tikhonov regularization. The numerical values of the muon transfer rate λ i = λ pO (E i ) for node energies in the range E i < 0.2 eV, calculated from Eq.…”

“…The energy dependence of the charge transfer rate in argon-nitrogen scattering at near-thermal collision energies was studied in [3][4][5]; Refs. [6,7] were focused on charge transfer at epithermal energies. Ref.…”

Electron emission from CH4 molecules in collisions with fast bare C ions

“…Moreover, to understand the electron emission from the PAH or DNA/RNA base molecules, the CH 4 plays an important role of a reference. There are several reports on the total ionization and electron capture studies for CH 4 in collisions with the protons as projectiles [25][26][27][28][29][30][31][32][33][34][35]. Several groups have also studied the dissociative ionization of CH 4 with protons [36][37][38][39][40], C and F ions [41] as projectiles.…”

Division Xii / Commission 14 / Working Group Collision Processes

“…with water; H +(Lindsay et al 2005a), He 2+(Abu-Haija et al 2005b, Kusakabe et al 2006, and O 6+(Seredyuk et al 2005b) with CO 2 ; H + with NH 2; He 2+(Abu-Haija et al 2005b, Kusakabe et al 2006 with NH 3 ; H +(Lindsay et al 2005b), He 2+…”