Showing papers by "Mary K. Gilles published in 1991"
TL;DR: The ultraviolet negative ion photoelectron spectrum of Pd−2 is presented for electron binding energies up to 3.35 eV in this paper, where the anion is prepared by sputtering in a flowing afterglow ion source.
Abstract: The ultraviolet negative ion photoelectron spectrum of Pd−2 is presented for electron binding energies up to 3.35 eV. The anion is prepared by sputtering in a flowing afterglow ion source. Multiple low‐lying electronic states of Pd2, all unidentified previously, are observed with resolved vibrational structure. The spectrum shows two strong electronic bands, each with similar vibrational progressions. Franck–Condon analyses are carried out on the two transitions and molecular constants are extracted for the anion and the two neutral electronic states. With the help of simple molecular orbital arguments and ab initio calculations, these two electronic bands are assigned as the triplet ground state (3Σ+u) and a singlet excited state (1Σ+u). The adiabatic electron affinity is E.A.(Pd2)=1.685±0.008 eV and the singlet excitation energy T0(1Σ+u) is 0.497±0.008 eV (4008±65 cm−1 ). The bonding in the palladium dimers is discussed and we find that the anion bond strength is 1.123±0.013 eV stronger than that of the...
64 citations
TL;DR: In this article, a Franck-Condon analysis of the relative intensities of the observed transitions was used to obtain a 1.670 (10) A and a CuO − vibrational frequency of 739 (25) cm −1 for the Y 2 Σ + excited state of CuO.
Abstract: Laser photoelectron spectroscopy has been used to study the CuO − anion and neutral CuO molecule. Analysis of the photoelectron spectrum yields an electron affinity of 1.777 (6) eV for CuO. Equilibrium bond lengths and vibrational frequencies are obtained from a Franck-Condon analysis of the relative intensities of the observed transitions, yielding a CuO − bond length of 1.670 (10) A and a CuO − vibrational frequency of 739 (25) cm −1 . The analysis also yields a bond length (1.704 (10) A) and a vibrational frequency (682 (25) cm −1 ) for the Y 2 Σ + excited state of CuO
58 citations
TL;DR: In this article, the spin-orbit splitting of the IO ground state is determined to be −2091(40) cm−1, and the electron affinity of IO is found to be 2.378(5) eV.
Abstract: The 351 nm (hν=3.531 eV) photoelectron spectrum IO− shows transitions to two spin–orbit states of neutral IO. The electron affinity of IO is found to be 2.378(5) eV. Vibrational frequencies for the neutral (2Π1/2) and anion (1Σ+) states are reported. The spin–orbit splitting of the IO ground state is determined to be −2091(40) cm−1. Franck–Condon analysis of the IO vibrational progressions were used along with the previously determined 2Π3/2 molecular constants to obtain the equilibrium bond lengths of the anion (1Σ+) and neutral (2Π1/2) states.
48 citations