Cation-π Complexes of Silver Studied with Photodissociation and Velocity-Map Imaging.

Ag(aromatic) ion-molecule complexes of benzene, toluene, or furan are generated in the gas phase by laser vaporization in a supersonic expansion. These ions are mass selected in a time-of-flight spectrometer and studied with ultraviolet laser photodissociation and photofragment imaging. UV laser excitation results in dissociative charge transfer (DCT) for these ions, producing neutral silver atom and the respective aromatic cation as the photofragments.

Infrared spectroscopy of H(CO) in the gas phase and in para-hydrogen matrices.

The H(CO) and D(CO) molecular ions were investigated by infrared spectroscopy in the gas phase and in para-hydrogen matrices. In the gas phase, ions were generated in a supersonic molecular beam by a pulsed electrical discharge. After extraction into a time-of-flight mass spectrometer, the ions were mass selected and probed by infrared laser photodissociation spectroscopy in the 700 cm-3500 cm region.

Computer-aided planning with exact implementation into surgical technique in TKA is as accurate as intraoperative navigation.

Background: Exact positioning of implants and accuracy of alignment are important parameters to provide an long survivorship of endoprostheses after total knee arthroplasty. It was suggested that an alignment within 3∘ from centerline provides the best long-term survivorship of TKA. Therefore, computer-assisted navigation became more important in TKAs.

From the tunneling dimer to the onset of microsolvation: Infrared spectroscopy of allyl radical water aggregates in helium nanodroplets.

The infrared spectrum of allyl:water clusters embedded in helium nanodroplets was recorded. Allyl radicals were produced by flash vacuum pyrolysis and trapped in helium droplets. Deuterated water was added to the doped droplets, and the infrared spectrum of the radical water aggregates was recorded in the frequency range 2570-2820 cm.

Understanding the microsolvation of radicals: Infrared spectroscopy of benzyl radical water clusters.

The IR spectrum of benzyl radical:water clusters was recorded. Benzyl radicals were produced by vacuum flash pyrolysis and trapped in superfluid helium nanodroplets. The infrared spectrum of benzyl radical water aggregates in the range 2585-2820 cm was recorded by subsequent addition of deuterated water.

Helium droplet infrared spectroscopy of glycine and glycine-water aggregates.

Infrared absorption spectra of glycine and glycine-water aggregates embedded in superfluid helium nanodroplets were recorded in the frequency range 1000-1450 cm. For glycine monomer, absorption bands were observed at 1106 cm, 1134 cm, and 1389 cm. These bands were assigned to the C-OH stretch mode of the glycine conformers I, III and II, respectively.

Infrared spectroscopy of the helium solvated cyclopentadienyl radical in the CH stretch region.

Cyclopentadienyl radicals were produced by vacuum flash pyrolysis and trapped in superfluid helium nanodroplets. The infrared spectrum of the embedded radicals was recorded in the range 3020-3120 cm(-1). Three bands observed at 3056.

Infrared spectroscopy of the ν2 band of the water monomer and small water clusters (H2O)n=2,3,4 in helium droplets.

We have recorded infrared spectra in the frequency range of the ν2 band of water monomer and water clusters in superfluid helium droplets. In order to be able to map the chemically important fingerprint range, we have used an IR quantum cascade laser as a radiation source. We were able to observe three ro-vibrational transitions of the water monomer between 1590 and 1670 cm(-1).

Reassignment of ν2,3 IR band of the allyl radical in liquid helium nanodroplets.

We have recorded the IR-spectrum of the deuterated allyl radical in the frequency range of the CH stretch vibrations in liquid helium nanodroplets. Comparison to the allyl radical spectrum enabled us to make an unambiguous assignment. Based on these new experimental measurements, a reassignment of the ν2,3 IR bands was deemed necessary.

Complexation of allyl radicals and hydrochloric acid in helium nanodroplets.

Infrared spectra of the allyl radical-HCl complex in superfluid helium nanodroplets have been recorded in the IR frequency range of 2750-3120 cm(-1). Six fundamental bands were observed, five of which have been assigned to the C-H stretch vibrations of the allyl radical. No additional CH bands were observed upon the binding of HCl.

IR-spectroscopic study of the allyl + NO reaction in helium nanodroplets.

The IR-spectrum of the allyl-NO adduct (CH2-CH-CH2-NO) in helium nanodroplets has been recorded in the frequency region 2850-3120 cm(-1). CH2-CH-CH2-NO has been investigated as a prototype of the product of radical-radical reactions at 0.37 K.