Excited state dynamics of deprotonated and protonated fluorescein were investigated by polarization dependent femtosecond time-resolved pump-probe photofragmentation in a 3D ion trap. Transients of deprotonated fluorescein exhibit vibrational wavepacket dynamics with weak polarization dependence. Transients of protonated fluorescein show only effects of molecular alignment and rotational dephas...

Rotationally resolved gas-phase absorption spectra of partially and fully deuterated linear seven-carbon chain radicals are presented in this article. The carbon-based molecules are generated in a supersonically expanding planar plasma by discharging a gas mixture of acetylene and deuterium-enriched acetylene in helium and argon. Spectra are recorded in direct absorption using cavity ring-down ...

The hyperfine structure of highly charged 238 92 U ions with rotationally excited nuclei Abstract The hyperfine structure (hfs) of electron levels of 238 92 U ions with the nucleus excited in the low-lying rotational 2 + state with an energy E 2 + = 44.91 keV is investigated. In hydrogenlike uranium, the hfs splitting for the 1s 1/2-ground state of the electron constitutes 1.8 eV. The hyperfine...

Vibrational autoionization of individual rotational levels of np (n ­ 1) and nf (n ­ 1) Rydberg states of nitric oxide (NO) with 11 # n # 15 have been studied employing two-color double-resonance excitation via the NO A S1 (ni ­ 1) state. The rotational state distributions of the resulting NO X S1 (n ­ 0) ion have been determined by time-of-flight photoelectron spectroscopy. These measurements ...

The S1←S0 00 transitions of phenol and the hydrogen bonded phenol~H2O!1 cluster have been studied by high resolution fluorescence excitation spectroscopy. All lines in the monomer spectrum are split by 5664 MHz due to the internal rotation of the 2OH group about the a axis. The barrier for this internal motion is determined in the ground and excited states; V29 5 1215 cm , and V2854710 cm . The...

We have performed quantum mechanical (QM) dynamics calculations within the independent-state approximation with new benchmark triplet A" and A' surfaces [B. Ramachandran et al., J. Chem. Phys. 119, 9590 (2003)] for the rovibronic state-to-state measurements of the reaction O(3P)+HCl(v=2,j=1,6,9)-->OH(v'j')+Cl(2P) [Zhang et al., J. Chem. Phys. 94, 2704 (1991)]. The QM and experimental rotational...

We present a full dimensional quantum mechanical treatment of collisions between two H(2) molecules over a wide range of energies. Elastic and state-to-state inelastic cross sections for ortho-H(2) + para-H(2) and ortho-H(2) + ortho-H(2) collisions have been computed for different initial rovibrational levels of the molecules. For rovibrationally excited molecules, it has been found that state-...

A complete quantum study for the state-to-state Li + HF(v,j,m) LiF(v0,j0,O0) + H reactive collisions has been performed using a wave packet method, for different initial rotational states and helicity states of the reactants. The state-to-state differential cross section has been simulated, and the polarization of products extracted. It is found that the reactivity is enhanced for nearly collin...