Articles you may be interested inTemperature-dependent Raman and ultraviolet photoelectron spectroscopy studies on phase transition behavior of VO2 films with M1 and M2 phases J. Appl. Phys. 115, 153501 (2014); 10.1063/1.4870868Ammonia cluster anions and their relationship to ammoniated (solvated) electrons: The photoelectron spectra of ( NH 3 ) n=41-1100 − Anion photoelectron spectra of the carbon monohydrides, C 2n H Ϫ for nϭ1 -4 and C 2n D Ϫ for nϭ1 -3, have been measured. The spectra were recorded at a wavelength of 266 nm ͑4.657 eV͒ and yield electron affinities for each species. The spectra are vibrationally resolved, and some of the vibrational modes in the neutral C 2n H͑D͒ radicals are assigned. In addition, photoelectron angular distributions allow one to distinguish between photodetachment transitions to the 2 ⌺ ϩ and 2 ⌸ states of the neutrals. The spectra confirm previous work showing that C 2 H and C 4 H have 2 ⌺ ϩ ground states, while C 6 H and C 8 H have 2 ⌸ ground states. In addition, we observe the low-lying 2 ⌸ or 2 ⌺ ϩ excited states for all four radicals. The photoelectron angular distributions also serve as a probe of vibronic coupling between the 2 ⌺ ϩ and 2 ⌸ states. These effects are particularly prominent in the C 2 H Ϫ and C 4 H Ϫ spectra.

Resonant multiphoton detachment spectroscopy has been used to obtain vibrationally resolved spectra of the C 2Π←X 2Π electronic transitions in C−4, C−6, and C−8. Transitions due to vibrational excitations in the totally symmetric stretching modes as well as the bending modes are observed. The electron detachment dynamics subsequent to multiphoton absorption are studied by measuring the electron emission time profiles and electron kinetic energy distributions. The observation of delayed electron emission combined with the form of the electron kinetic energy distributions indicates that these species undergo the cluster equivalent of thermionic emission. This interpretation is supported by comparing the experimental results to a microcanonical model for cluster thermionic emission.

The low-lying electronic states of ozone are studied using anion photoelectron spectroscopy of 0,. The spectra show photodetachment transitions from 0; to the r? 'A, ground state and to the five lowest lying electronic states of the ozone molecule, namely the 3A2, 3B,, 'A2, 3B t , and 'B t states. The geometry of the ozonide anion determined from a Franck-Condon analysis of the O3 X 'A 1 ground state spectrum agrees reasonably well with previous work. The excited state spectra are dominated by bending vibrational progressions which, for some states, extend well above the dissociation asymptote without noticeable lifetime broadening effects. Preliminary assignments are based upon photoelectron angular distributions and comparison with ab initio calculations. None of the excited states observed lies below the ground state dissociation limit of O3 as suggested by previous experimental and theoretical results.