ISSN:
1434-6079
Keywords:
36.40 + d
;
82.30.N
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Neutral clusters (NH3) n ((CH3)3N) m and (H2O) n ((CH3)3N) m , prepared in a pulsed nozzle supersonic expansion, are ionized by multiphoton ionization and investigated with a reflectron time-of-flight mass spectrometry technique. The observed mixed cluster ions display a maximum intensity atm=2(n+1) whenn ≦ 5 for (NH3) n ·((CH3)3N) m H+ andm=n+2 whenn ≦ 4 for (H2O) n ((CH3)3N) m H+ indicating that the cluster ions with these combinations have a stable closed shell structure. However, the pattern begins to break down whenn〉5 for ammonia system andn〉4 for water system. Thereupon, the most intense peaks are reached with one molecule less than the pattern required, i.e.m=2(n+1)−1 whenn=6 for (NH3) n ((CH3)3N) m H+ andm=(n+2)−1 whenn=5 for (H2O) n ((CH3)3N) m H+. These findings strongly suggest the onset of hydrogen-bonded ring structures from chain-like ones at critical cluster sizes. This is also supported by the studies of the metastable decomposition.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01543935
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