Pulsed-Laser Atom-Probe FIM Study of Solid Surfaces

Molecular cationNHe2+

“…The entrance channels for the charge-transfer reaction (1) are electronic states of the molecular ion NHe + of X+ and II symmetries separating at large internuclear distances to the doubly charged N +(2p, P') ion and a neutral helium atom He(ls, 'S). At large separations, the potential energy tends to the polarization attraction -2aR where u is the polarizability of He.…”

“…Doubly charged molecular ions containing helium and transition metals were detected experimentally by Tsong and Kinkus [1] and studied theoretically by Hotokka et al [2]. The simple dication CHe + has been studied theoretically by Harrison et al.…”

“…If E, is the initial kinetic energy at infinite separation in the entrance channel and p is the reduced mass, section o is expressed in terms of I';f, the probability that a system initially in channel i exits in channel f. The cross section for transition i to , is the probability the particles approach in electronic state i, k, =pu;!fi is the initial wave number, and J," is the largest value of J for which the crossing point is energetically accessible.For approach along the 2 X+ curve, g;= -, '. Charge transfer is described by the system exiting along the1 X+ curve. The probability of doing so is a sum of the probabilities for the individual suitable paths: FIG.…”

Theoretical investigation of HNgNH3+ ions (Ng = He, Ne, Ar, Kr, and Xe)

“…In fact, a series of charged Ng compounds, such as ArCH n + (n = 0, 2, and 3), 19,20 He 3 + , 21 He n H + (n ≥ 2), 22 NgHNg + (Ng = Ar, Kr, and Xe), 23,24 XeNe 2+ , 25 NgH + (Ng = He, Ne, Ar, Kr, and Xe), [26][27][28][29] PtHe 2+ , 30 Ar 3 + , 31 and He 2 2+ , 32 have previously been detected. Moreover, a considerable number of theoretical investigations have predicted the existence of other charged Ng compounds, such as AuNg + , 33 He n + and He n − (n > 1), 34 HC(Ng) n + (Ng = He, Ne, Ar, Kr, and Xe; n = 1 and 2), 35 and HNgHNgH + (Ng = Ar, Kr, and Xe).…”

Towards Detection of a Long-lived Protonated Metal Cation: Generation of GeH2+ Using High-Energy Collisions

“…[10] Considerable controversy surrounds the proposed detection of CH 2 , [11±15] and very recent experiments refute its existence. [16] Calculations do however suggest that long-lived 2 S CH 2 may be detectable, provided it is possible to generate this ion at all, as poor Franck ± Condon factors render its generation from CH in charge-stripping experiments almost impossible.…”