Photodetachment-photoelectron spectroscopy of disulfanide: the ground and first excited electronic state of HS2 and DS2.
Photodetachment-photoelectron spectra of HS(2)(-) and DS(2)(-) are presented. The obtained electron affinities (EA (HS(2)) = 1.916 +/- 0.015 eV and EA (DS(2)) = 1.918 +/- 0.015 eV) are in good agreement with earlier results (S. Moran and G. B. Ellison, J. Phys. Chem., 1988, 92, 1794). Photodetachment into the neutral ground state of the radicals HS(2) and DS(2) leads to excitation of the S-S stretching mode, whereas photodetachment into the first excited state causes a S-S-H bending and a weak S-H stretching motion. Additionally, weak peaks of S(2) were observed in the spectra of HS(2) and DS(2), leading to the conclusion that photodetachment with 2.77 eV (448 nm) causes dissociation of HS(2)(-) and DS(2)(-) into S(2)(-) and H/D. Taking 2.77 eV as an upper limit for D(0)(S(2)(-)-H) a lower limit for Delta(f)H(0)(HS(2 (g))) of 100.8 kJ mol(-1) is obtained which is an improvement on the literature value of 107.145 +/- 10.46 kJ mol(-1).
Department of Chemistry, Technical University of Munich, Garching, 85747, Germany.
Michaela
M
Entfellner
Ulrich
U
Boesl
D004583:Electrons; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D015394:Molecular Structure; D055668:Photochemical Processes; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry; D013816:Thermodynamics
D013438:Sulfhydryl Compounds; D013455:Sulfur