Abstract.
The 7-azaindole (7-AzI) cluster anions and their H2O adducts were generated by electron attachment to the 7-AzI/7-AzI–H2O clusters, and their electronic properties studied with mass spectrometry and photoelectron spectroscopy. In the mass spectra of the 7-AzI cluster anions, (7-AzI) n -, monomer anions were missing due to negative electron affinity (EA), while clusters (n≥2) have positive EA, and those having even n were more abundant than those at odd n. EA increased with cluster size from 0.88 eV at n=2, and an even–odd alternation in the EA was seen. The even–odd alternation showed that the 7-AzI dimer acts as a unit for cluster formation. In the photoelectron spectrum of (7-AzI)2 - at 266 nm, the second peak was observed 2.4 eV above the first peak; this is attributed to the triplet state of the neutral (7-AzI)2. Depending on the detachment energy, a movable peak, with the detachment of 420–300 nm (2.9–4.1 eV), was additionally observed between the first and the second peaks; this was thought to be caused by a delayed photoemission via an electronic excited state of the (7-AzI)2 - anion.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 31 August 1998 / Received in final form: 15 December 1998
Rights and permissions
About this article
Cite this article
Nakajima, A., Negishi, Y., Hasumi, R. et al. Photoelectron spectroscopy of 7-azaindole–water cluster anions. Eur. Phys. J. D 9, 303–307 (1999). https://doi.org/10.1007/s100530050444
Issue Date:
DOI: https://doi.org/10.1007/s100530050444