Fachgebiet Lasermolekülspektroskopie und Umweltphysik

10 Items

Recent Submissions
Nature of the interaction between rare gas atoms and transition metal doped silicon clusters: the role of shielding effects

Vu Thi Ngan ; Janssens, Ewald ; Claes, Pieterjan ; Fielicke, André ; Minh Tho Nguyen ; Lievens, Peter (2015)

Mass spectrometry experiments show an exceptionally weak bonding between Si7Mn+ and rare gas atoms as compared to other exohedrally transition metal (TM) doped silicon clusters and other SinMn+ (n = 5-10) sizes. The Si7Mn+ cluster does not form Ar complexes and the observed fraction of Xe complexes is low. The interaction of two cluster series, SinMn+ (n = 6-10) and Si7TM+ (TM = Cr, Mn, Cu, and...

Vibrational spectra and structures of SinC clusters (n=3-8)

Nguyen Xuan Truong ; Savoca, Marco ; Harding, Dan J. ; Fielicke, André ; Dopfer, Otto (2015)

The effects of doping bare silicon clusters with carbon on their physical properties are of fundamental interest for the chemistry of the interstellar medium and the development of novel nanostructures in materials science. Carbon-doped silicon clusters (SinC, n = 3-8) are characterized in the gas phase with infrared-ultraviolet two-color ionization (IR-UV2CI) spectroscopy, mass spectrometry, a...

Diastereo-specific conformational properties of neutral, protonated and radical cation forms of (1R,2S)-cis- and (1R,2R)-trans-amino-indanol by gas phase spectroscopy

Bouchet, Aude ; Klyne, Johanna ; Piani, Giovanni ; Dopfer, Otto ; Zehnacker, Anne (2015)

Chirality effects on the intramolecular interactions strongly depend on the charge and protonation states. Here, the influence of chirality on the structure of the neutral, protonated, and radical cation forms of (1R,2S)-cis- and (1R,2R)-trans-1-amino-2-indanol diastereomers, prototypical molecules with two chiral centers, is investigated in a molecular beam by laser spectroscopy coupled with q...

IR spectrum of the protonated neurotransmitter 2-phenylethylamine: dispersion and anharmonicity of the NH3+-pi interaction

Bouchet, Aude ; Schütz, Markus ; Chiavarino, Barbara ; Crestoni, Maria Elisa ; Fornarini, Simonetta ; Dopfer, Otto (2015)

The structure and dynamics of the highly flexible side chain of (protonated) phenylethylamino neurotransmitters are essential for their function. The geometric, vibrational, and energetic properties of the protonated neutrotransmitter 2-phenylethylamine (H(+)PEA) are characterized in the N-H stretch range by infrared photodissociation (IRPD) spectroscopy of cold ions using rare gas tagging (Rg ...

Single water solvation dynamics in the 4-aminobenzonitrile-water cluster cation revealed by picosecond time-resolved infrared spectroscopy

Miyazaki, Mitsuhiko ; Nakamura, Takashi ; Wohlgemuth, Matthias ; Mitrić, Roland ; Dopfer, Otto ; Fujii, Masaaki (2015)

The dynamics of a solvent is important for many chemical and biological processes. Here, the migration dynamics of a single water molecule is triggered by the photoionization of the 4-aminobenzonitrile-water (4ABN-W) cluster and monitored in real time by picosecond time-resolved IR (ps TRIR) spectroscopy. In the neutral cluster, water is hydrogen-bonded to the CN group. When this CN-bound clust...

Mass analyzed threshold ionization detected infrared spectroscopy: isomerization activity of the phenol-Ar cluster near the ionization threshold

Miyazaki, Mitsuhiko ; Yoshikawa, Shunpei ; Michels, François ; Misawa, Kentaro ; Ishiuchi, Shun-ichi ; Sakai, Makoto ; Dopfer, Otto ; Müller-Dethlefs, Klaus ; Fujii, Masaaki (2015)

The structure of the phenol-argon cluster (PhOH-Ar) in high-n Rydberg states is investigated by the newly developed technique of mass analyzed threshold ionization detected infrared (MATI-IR) spectroscopy. This method selectively measures IR spectra of molecular clusters in very high-n Rydberg states (n > 100) utilized in zero kinetic energy (ZEKE) photoelectron and MATI spectroscopy, whose ion...

Photoionization-induced pi <-> H site switching dynamics in phenol(+)-Rg (Rg = Ar, Kr) dimers probed by picosecond time-resolved infrared spectroscopy

Miyazaki, Mitsuhiko ; Sakata, Yuri ; Schütz, Markus ; Dopfer, Otto ; Fujii, Masaaki (2016)

The ionization-induced pi <-> H site switching reaction in phenol(+)-Rg (PhOH+-Rg) dimers with Rg = Ar and Kr is traced in real time by picosecond time-resolved infrared (ps-TRIR) spectroscopy. The ps-TRIR spectra show the prompt appearance of the non-vanishing free OH stretching band upon resonant photoionization of the pi-bound neutral clusters, and the delayed appearance of the hydrogen-bond...

Structural motifs of 2-(2-fluoro-phenyl)-ethylamine conformers

Mayorkas, Nitzan ; Sachs, Hanan ; Schütz, Markus ; Ishiuchi, Shun-ichi ; Fujii, Masaaki ; Dopfer, Otto ; Bar, Ilana (2016)

Vibronic and vibrational spectra of 2-(2-fluoro-phenyl)-ethylamine (2-FPEA) conformers were measured in a molecular beam by resonant two-photon ionization (R2PI), ultraviolet-ultraviolet hole burning (UV-UV HB) spectroscopy, and ionization-loss stimulated Raman spectroscopy (ILSRS). The measured ILSR spectral signatures in the survey spectra of the amino group region and in the broad spectral r...

Structural determination of niobium-doped silicon clusters by far-infrared spectroscopy and theory

Li, Xiaojun ; Claes, Pieterjan ; Härtelt, Marko ; Lievens, Peter ; Janssens, Ewald ; Fielicke, André (2016)

In this work, the structures of cationic SinNb+ (n = 4-12) clusters are determined using the combination of infrared multiple photon dissociation (IR-MPD) and density functional theory (DFT) calculations. The experimental IR-MPD spectra of the argon complexes of SinNb+ are assigned by comparison to the calculated IR spectra of low-energy structures of SinNb+ that are identified using the stocha...

Infrared spectrum of the cold ortho-fluorinated protonated neurotransmitter 2-phenylethylamine: competition between NH+center dot center dot center dot pi and NH+center dot center dot center dot F interactions

Schütz, Markus ; Bouchet, Aude ; Dopfer, Otto (2016)

Halogenation of pharmaceutical molecules is a common tool to modify their physiological properties. The geometric, vibrational, and electronic properties of the ortho-fluorinated protonated neurotransmitter 2-phenylethylamine (oF-H(+)PEA) are characterized by infrared photodissociation (IRPD) spectroscopy in the NH stretch range using the messenger technique and dispersion-corrected density fun...