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Quantized sequential decay series of metastable N2 cluster ions (N2)n+* → (N2)n-1+* → … → N2+

✍ Scribed by P. Scheler; T.D. Märk

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
738 KB
Volume
148
Category
Article
ISSN
0009-2614

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✦ Synopsis

The first experimental observation of sequential decay of metastable molecular cluster ions is reported. Nz cluster ions are produced by electron impact ionization of a supersonic Nz cluster beam and analyzed by a double-focusing sector field mass spectrometer (reversed geometry). It is found that metastable N2 cluster ions lose more than one N2 molecule in the microsecond time regime and decay predominantly via sequential series (NZ)n+*-' (N&T, +...-+N: , evaporating a single monomer in each of these successive decay steps. The metastable decay rates determined in detail for cluster sizes 2g n d 6 and n = 20 lie between 1 and 1 O6 s-' and depend strongly on the time elapsed after ion formation. The decay rates exhibit a quasi-periodic pattern, consistent with the assumption that up to four vibrational quanta (stored in neutral N2 molecules within the cluster) relax into the phonon bath of the cluster during the sampling time.

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