In:
The Journal of Chemical Physics, AIP Publishing, Vol. 114, No. 14 ( 2001-04-08), p. 6072-6076
Abstract:
A variable temperature-selected ion flow drift tube (VT-SIFDT) has been used to measure the mobilities of NH4+(NH3)n clusters drifting in He. The mobilities have been measured for n=0–2 at 298 K, n=0–3 at 200 K, and n=0–5 at 100 K, marking the first mobilities experiments for these clusters below room temperature. The reduced mobilities measured at 298 K are compared to the previous SIFDT results of Krishnamurthy et al. [J. Chem. Phys. 106, 530 (1997)] for n=0–2. While the current results compare quite favorably for n=0–2, there is a discrepancy for n=3 which is addressed by current 100 K and 200 K data where these species are thermally stable. The trends in the mobilities from 100 K to 298 K as a function of E/N and effective temperature reveal that the repulsive part of the He–NH4+(NH3)n interaction potential is sampled predominantly for n=1–5. However, the attractive part of the potential is accessed at the lowest temperatures for He–NH4+.
Type of Medium:
Online Resource
ISSN:
0021-9606
,
1089-7690
Language:
English
Publisher:
AIP Publishing
Publication Date:
2001
detail.hit.zdb_id:
3113-6
detail.hit.zdb_id:
1473050-9
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