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Photoionization of hypervalent molecular clusters: electronic structure and stability of NH4 (NH3)n

✍ Scribed by Kiyokazu Fuke; Ryozo Takasu; Fuminori Misaizu

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
686 KB
Volume
229
Category
Article
ISSN
0009-2614

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✦ Synopsis

Ammoniated NH4 radicals produced by an ArF excimer laser photolysis of ammonia clusters are studied by one-photon ionization and time-of-flight mass spectroscopy. The ionization potentials (IPs) of NH,(NH,), (n=O-35) are determined by the photoionization threshold measurements. The binding energies of NH4(NH3)._,-NH3

(n= l-6) are estimated from IPs. The results indicate that the bonding between NH4 and NH3 is semi-ionic. The IPs for larger clusters are found to decrease monotonically with increasing n to a limit of 1.33 eV, which coincides with the photoemission threshold of liquid NH,. This feature is similar to those found recently for alkali atoms-ammonia clusters.

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