Mass spectrometric and computational study of SnPb in the gas phase.
The SnPb molecule has been identified in a Knudsen effusion mass spectrometry experiment. The direct dissociation reaction and two isomolecular exchange reactions involving the Sn(2) and Pb(2) molecules have been studied, in the 1426-1705 K range of temperatures, using both second and third law procedures. The D(degree)0(SnPb,g) has been derived, for the first time, as (122.6+/-4.0) kJ mol(-1). Density functional and ab initio calculations up to the coupled clusters level of theory were also performed. In addition, the anion dissociation energy D(degree)0(SnPb(-),g) of (179.2+/-4.2) kJ mol(-1) was determined using the D(degree)0(SnPb,g) mass spectrometric value derived in this investigation and literature data.
Gigli
G
G
Dipartimento di Chimica, Università di Roma La Sapienza, piazzale A. Moro 5, 00185 Rome, Italy. a.gigli@caspur.it
Meloni
Giovanni
G
Carrozzino
M
M