A (3+1) resonance enhanced multiphoton ionization study of the C 1S+ and E 1P states of CO: polarization dependence used to probe electronic excitation routes and electronic character

The three-photon excitations of the C 1 + and E 1 states have been investigated with resonance enhanced multiphoton ionization spectroscopy as a function of the polarization of the excitation light. From the observed polarization dependence the contributions of the various excitation routes have been determined, and the electronic character of these states has been analyzed. The results indicate that the v=0 and 1 vibrational levels of the E 1 state have slightly different electronic characters. The Journal of Chemical Physics is copyrighted by The American Institute of Physics

Measurements and quasi-quantum modeling of the steric asymmetry and parity propensities in state-to-state rotationally inelastic scattering of NO (2?1/2) with D2.

Relative integrated cross sections are measured for spin-orbit-conserving, rotationally inelastic scattering of NO

Steric asymmetry and lambda-doublet propensities in state-to-state rotationally inelastic scattering of NO(2?1/2) with He.

Contains fulltext : 13854.pdf (publisher's version ) (Open Access

HD as a probe for detecting mass variation on a cosmological time scale

The strong electronic absorption systems of the B-1 Sigma(+)(u)-X-1 Sigma(+)(g) Lyman and the C-1 Pi(u)-X-1 Sigma(+)(g) Werner bands can be used to probe possible mass-variation effects on a cosmological time scale from spectra observed at high redshift, not only in H-2 but also in the second most abundant hydrogen isotopomer HD. High resolution laboratory determination of the most prominent HD lines at extreme ultraviolet wavelengths is performed at an accuracy of Delta lambda/lambda similar to 5x10(-8), forming a database for comparison with astrophysical data. Sensitivity coefficients K-i=dln lambda(i)/dln mu are determined for HD from quantum ab initio calculations as a function of the proton-electron mass ratio mu. Strategies to deduce possible effects beyond first-order baryon/lepton mass ratio deviations are discussed