Time-resolved photoelectron spectra of Pt2(N2)

• Published in: Journal of electron spectroscopy and related phenomena Vol. 144-147; no. Complete; pp. 91 - 96
• Main Authors: Neeb, M., Stanzel, J., Pontius, N., Eberhardt, W., Lüttgens, G., Bechthold, P.S., Friedrich, C.
• Format: Journal Article
• Language: English
• Published: 01.06.2005
• ISSN: 0368-2048
• DOI: 10.1016/j.elspec.2005.01.231

Pump--probe photoelectron detachment spectra of Pt2(N2)(--)have been measured using two subsequent fs--laser pulses. The time--resolved spectra show two parallel dissociation channels: photoinduced thermal desorption of N2 from the cluster ''surface'' as well as breaking of the intermetallic Pt--Pt bond. For both fragmentation channels the dissociation energy is less than 1*5eV. Density--functional calculations predict a linear geometry of neutral and anionic Pt2(N2). The calculated electron affinity of the neutral linear cluster (3*2eV) agrees reasonably with the experimental value of (2*8+/--0*2)eV. Using the statistical RRK approach an intermetallic dissociation energy of 0*4eV has been estimated from the measured dissociation rate.