Mats Doverstål

The 3Π0u ← X 3Δ1g band system of jet‐cooled Ti2

A band of jet‐cooled 48Ti2 has been located in the near infrared by resonant two‐photon ionization spectroscopy. Rotational analysis has shown the band to be an Ω’=0±←Ω‘=1 transition, which is consistent with the 3Δg ground state proposed by Bauschlicher et al. [J. Chem. Phys. 95, 1057 (1991)]. The band is assigned as a 3Π0u ← X 3Δ1g transition, and lower and upper state bond lengths have been determined as r0(X 3Δg)=1.9422±0.0008 A and r0(3Πu)=1.997±0.009 A (1σ error limits, corrected for spin–uncoupling effects). Comparisons are made to the TiV and V2 molecules, a rationale for the unusual filling order of the 3d‐based molecular orbitals is provided, and molecular orbital assignments are considered for the excited 3Πu state.

The 3Δu−X3Δg band system of jet-cooled Ti2

Abstract Jet-cooled Ti 2 has been observed around 9100 cm −1 using the resonant two-photon ionisation technique. A band at 9097 cm −1 has been analysed as a 3 Δ 1u ← X 3 Δ 1g transition while a weaker structure at 9093 cm −1 has tentatively been labelled 3 Δ 2u ←X 3 Δ 2g .

Resonant two-photon ionization spectroscopy studies of jet-cooled

Resonant two-photon ionization spectroscopy in a jet-cooled molecular beam has been employed for the study of the zirconium dimer produced by laser ablation. More than 110 resonances have been observed in the wavelength region 610-1070 nm. Most of these resonances are transitions from of the ground state, which is shown to be a state, to different vibrational levels of the excited states. Three bands have been rotationally analysed. The ground state B-value is found to be . Radiative lifetimes have been measured for two excited states, both of them between 1 and .

Spectroscopy of mixed early–late transition metal diatomics: ScNi, YPd, and ZrCo

Resonant two‐photon ionization spectroscopy has been employed to investigate the spectra of the jet‐cooled transition metal diatomics ScNi, YPd, and ZrCo, which are isovalent species which possess (or are thought to possess) an X 2Σ+ ground state. Several electronic band systems have been observed for these species in the near infrared, and the analysis of these systems is reported. Ground state vibrational intervals of ΔG1/2‘ = 334.5 ± 1.0, 264.4±0.2, and 357.7 cm−1 have been determined for ScNi, YPd, and ZrCo, respectively. The spectroscopic results obtained for ScNi and YPd are compared to theoretical calculations performed by other researchers, and a discussion of the chemical bonding in these species is presented.

Reaction of small carbon clusters with hydrogen during laser vaporization of graphite

The hydrogen uptake for small carbon clusters C4 to C22 has been studied at high hydrogen pressure. This study indicate that both chain and ring structures exist in parallel.

Carbon cluster studies

The construction of a laser vaporization and cluster formation apparatus, equipped with a time-of-flight mass spectrometer, is described. Studies of carbon clusters with special emphasis on multiple charges, hydrogen uptake and appearance and abundance conditions are reported.

Spectroscopy of jet-cooled YCu

Optical spectra of jet‐cooled diatomic YCu have been recorded using resonant two‐photon ionization spectroscopy in a supersonic expansion of helium. The ground state is shown experimentally to be of 1Σ+ symmetry, with a measured bond length of re‘=2.6197(6) A and a vibrational frequency of 193.21(24) cm−1 for 89Y63Cu. Five excited electronic states are identified as the [10.2]1Σ+ state, the [11.8]3Π0+ state, the [12.0]3Π1 state, the [14.0]1Π state, and, with the help of ab initio theory, the [12.2]1Π state. No evidence whatever for participation of the 3d orbitals of copper in the chemical bonding is found, and the electronic structure of YCu is found to exhibit a striking similarity to that of YH.

The AX system of the copper dimer studied by resonant two-photon ionization spectroscopy

Abstract Rotational and mass-resolved spectra of the (0, 0), (1, 0) and (2, 0) bands of the A 1 Σ + u −X 1 Σ + g transition of Cu 2 have been recorded using the resonant two-photon ionization (R2PI) technique in a cluster beam apparatus. This study was motivated by the anomalous electronic isotope shifts in the AX and BX systems proposed by earlier investigators. The existence of such shifts would immediately be revealed using the R2PI technique as the mass resolution gives spectra of the isotopomers in different mass channels. Lifetime measurements at low pressures (10 −7 Torr) are also possible with this apparatus and improved results are reported for the A, B and C states.