✍ Scribed by B. von Issendorff; H. Haberland; R. Fröchtenicht; J.P. Toennies
No coin nor oath required. For personal study only.
In the size distribution of ionized helium clusters produced by electron impact ionization of very large neutral clusters (N > 105 atoms), He+ is the most abundant small cluster ion. This observation has recently received considerable attention, since in theoretical calculations no specially stable structure for the tetramer ion could be found. Measurements of the photoabsorption cross section and of the fragment kinetic energy release now indicate that this 'magic' He4 + is in a metastable electronically excited state.
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ThC cohcrcnt nature of molecular cxcikd dirners in th&r triplet states is unequivocally estabtishcd by a series of 10~' tempe&re~pti~y detected mapletic:csonnnce experimants in zero field. The results clearly establish that a . . : minimum cohcrcnce ti\_nc for the dimer $(+) siltc in 1,2,4,5tetrach
Picosecond kinetics of excited-state single-or double-proton transfer along intramolecular hydrogen bonds were analyzed for three molecules: 2,5-his-( 2-benzoxazolyl )hydroquinone, its monomethoxy-derivative and 3,6-bis-(bbenzoxazolyl)pyrocatechol. Forward and back proton-transfer rate constants wer