Excited state hydrogen transfer dynamics in phenol-(NH) studied by picosecond UV-near IR-UV time-resolved spectroscopy.

Time-evolutions of excited state hydrogen transfer (ESHT) in phenol (PhOH)-(NH) clusters have been measured by three-color picosecond (ps) ultraviolet (UV)-near infrared (NIR)-UV pump-probe ion dip spectroscopy. The formation of a reaction product, ˙NHNH, is detected by its NIR absorption due to a 3p-3s Rydberg transition. The ESHT reactions from all of the vibronic levels show biexponential time-evolutions, even from the S origin.

Hole-burning spectra of m-fluorophenol/ammonia (1:3) clusters and their excited state hydrogen transfer dynamics.

Hole-burning spectra of m-fluorophenol/ammonia (1:3) clusters are measured by four-color UV-near IR-UV-UV hole-burning spectroscopy. Cis and trans isomers of the cluster are clearly distinguished in the (1:3) cluster. Picosecond time evolutions of the excited state hydrogen transfer (ESHT) reaction in the (1:3) clusters are measured by the ion depletion due to 3p-3s Rydberg transition of reaction products ⋅NH(4)(NH(3))(2) lying in the near infrared region.

Electronic spectra of 7-azaindole/ammonia clusters and their photochemical reactivity.

The S(1)-S(0) electronic spectra of 7-azaindole-(NH(3))(n) clusters (n=1-3) were measured by mass-selected two-color resonance-enhanced multiphoton ionization spectroscopy. The laser-induced fluorescence spectrum obtained by monitoring the UV fluorescence shows well-structured vibrational bands for the monomer and 7-azaindole-(NH(3))(1,2) clusters, while no signals appear for the 7-azaindole-(NH(3))(3) cluster. The action spectrum obtained by monitoring visible emission shows no signal for all species, which suggests little reactivity for excited-state proton/hydrogen transfer.

Excited state hydrogen transfer in fluorophenol.ammonia clusters studied by two-color REMPI spectroscopy.

Two-color (1 + 1') REMPI mass spectra of o-, m- and p-fluorophenol.ammonia (1 ration) clusters were measured with a long delay time between excitation and ionization lasers. The appearance of NH(4)(NH(3))(n-1)(+) with 100 ns delay after exciting the S(1) state is a strong indication of generation of long-lived species via S(1).