High resolution UV resonance enhanced two-photon ionization spectroscopy with mass selection of biologically relevant molecules in the gas phase

2005 ◽  
Author(s):  
S. Chervenkov ◽  
P. Q. Wang ◽  
R. Karaminkov ◽  
T. Chakraborty ◽  
Juergen E. Braun ◽  
...  
Keyword(s):  
High Resolution ◽  
Gas Phase ◽  
Mass Selection ◽  
Biologically Relevant ◽  
Two Photon ◽  
Photon Ionization ◽  
Biologically Relevant Molecules ◽  
Selection Of

scholarly journals Simulated and Experimental Time-Resolved Photoelectron Spectra of the Intersystem Crossing Dynamics in 2-Thiouracil

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2836 ◽  
Author(s):  
Sebastian Mai ◽  
Abed Mohamadzade ◽  
Philipp Marquetand ◽  
Leticia González ◽  
Susanne Ullrich
Keyword(s):  
Gas Phase ◽  
Single Photon ◽  
Photoelectron Spectra ◽  
Time Resolved ◽  
Single Photon Ionization ◽  
Biologically Relevant ◽  
Two Photon ◽  
Photon Ionization ◽  
Ionic States ◽  
Good Agreement

We report time-dependent photoelectron spectra recorded with a single-photon ionization setup and extensive simulations of the same spectra for the excited-state dynamics of 2-thiouracil (2TU) in the gas phase. We find that single-photon ionization produces very similar results as two-photon ionization, showing that the probe process does not have a strong influence on the measured dynamics. The good agreement between the single-photon ionization experiments and the simulations shows that the norms of Dyson orbitals allow for qualitatively describing the ionization probabilities of 2TU. This reasonable performance of Dyson norms is attributed to the particular electronic structure of 2TU, where all important neutral and ionic states involve similar orbital transitions and thus the shape of the Dyson orbitals do not strongly depend on the initial neutral and final ionic state. We argue that similar situations should also occur in other biologically relevant thio-nucleobases, and that the time-resolved photoelectron spectra of these bases could therefore be adequately modeled with the techniques employed here.

High-resolution UV spectroscopy of vibronic bands in p-difluorobenzene and p-difluorobenzene–Ar: The role of Herzberg–Teller coupling

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1179-1186 ◽  
Author(s):  
R. Sussmann ◽  
R. Neuhauser ◽  
H. J. Neusser
Keyword(s):  
High Resolution ◽  
Electronic Excitation ◽  
Uv Spectroscopy ◽  
Van Der Waals ◽  
Rotational Structure ◽  
Moments Of Inertia ◽  
Van Der Waals Complex ◽  
Two Photon ◽  
Photon Ionization

Rotationally resolved spectra of two bands in the S1 → S0 transition of the p-difluorobenzene molecule and its van der Waals complex with Ar have been measured by mass-selective resonance-enhanced two-photon ionization. The rotational structure of the 000 and the 2710 bands in the monomer as well as in the complex differ from each other. They can be theoretically reproduced assuming a transition moment oriented along the short in-plane axis of the molecule in the case of the 000 transition and the long in-plane axis in the case of the 2710 transition. Since the magnitude of the moments of inertia is changed in the complex by adding an Ar atom, complexation leads to a change of rotational structures of the same band. The analysis of the rotational structure points to Herzberg–Teller coupling by vibronic interaction with the S2 (1B1u) state as the mechanism responsible for the appearance of the 2710 band. The rotational constants determined from a fit of the spectra yield an effective van der Waals distance of 3.55 (2) Å (1 Å = 10−10 m) of the Ar atom from the p-difluorobenzene plane, which decreases by 0.06 Å on electronic excitation to the S1 state.

scholarly journals Near-UV Resonant Two-Photon Ionization Spectroscopy of Gas Phase Guanine:  Evidence for the Observation of Three Rare Tautomers

2006 ◽  
Vol 110 (38) ◽  
pp. 10921-10924 ◽  
Author(s):  
Michel Mons ◽  
François Piuzzi ◽  
Iliana Dimicoli ◽  
Leonid Gorb ◽  
Jerzy Leszczynski
Keyword(s):  
Gas Phase ◽  
Two Photon ◽  
Photon Ionization ◽  
Rare Tautomers

scholarly journals Detecting Chirality in Mixtures Using Nanosecond Photoelectron Circular Dichroism

2022 ◽  
Author(s):  
Simon Ranecky ◽  
G. Barratt Park ◽  
Peter C Samartzis ◽  
Ioannis C. Giannakidis ◽  
Dirk Schwarzer ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
High Resolution ◽  
Gas Phase ◽  
Molecular Beams ◽  
Structural Isomers ◽  
Photon Ionization ◽  
Phase Mixture ◽  
Circular Dichroïsm

We report chirality detection of structural isomers in a gas phase mixture using nanosecond photoelectron circular dichroism (PECD). Combining pulsed molecular beams with high-resolution resonance enhanced multi-photon ionization (REMPI) allows...

High resolution resonance enhanced two photon ionization spectroscopy of RbCs in a cold molecular beam

2001 ◽  
Vol 114 (20) ◽  
pp. 8926-8931 ◽  
Author(s):  
Youngjee Yoon ◽  
Yonghoon Lee ◽  
Taeshick Kim ◽  
Jeung Sun Ahn ◽  
Younghee Jung ◽  
...  
Keyword(s):  
High Resolution ◽  
Molecular Beam ◽  
Two Photon ◽  
Photon Ionization

Combined High Resolution UV and Microwave Results: Structure of the Benzonitrile•Water Complex

1997 ◽  
Vol 52 (8-9) ◽  
pp. 655-664 ◽  
Author(s):  
R. M. Helm ◽  
H.-P. Vogel ◽  
H. J. Neusser ◽  
V. Storm ◽  
D. Consalvo ◽  
...  
Keyword(s):  
High Resolution ◽  
Uv Spectra ◽  
Line Broadening ◽  
Additional Information ◽  
Two Photon ◽  
Structure Changes ◽  
Quadrupole Coupling ◽  
Photon Ionization ◽  
Nuclear Quadrupole ◽  
First Time

Abstract High resolution ultraviolet (UV) and molecular beam Fourier transform microwave (MB FTMW) spectroscopy of the benzonitrile·water (BZNW) cluster were performed to measure cluster structures in the S0 and S1 states. The MW experiments provide additional information on the structure and the 14N-nuclear quadrupole coupling in the ground state So, the UV experiments on the dynamics in Si. The rotationally resolved sub-Doppler UV spectra of BZNW were measured by mass-selective resonance-enhanced two-photon ionization. For the first time this UV technique has been applied to hydrogen-bonded clusters. From the UV spectra the rotational constants are obtained by Correlation Automated Rotational Fitting. The MW spectra were analyzed with the model of a centrifugally distorted rotor including nuclear quadrupole coupling. A r0 -fit of the water position within the cluster is performed. The water is found to be located with its oxygen nearly in the plane of benzonitrile (BZN). For S0 (S1), the distance of the oxygen to the ortho hydrogen is r0 = 2.477(4) Å (2.457(2) Å) and the angle to the ortho carbon-hydrogen bond 143.34(2)° (141.91(3)°). The structure differences in S1 and S0 can be explained by the structure changes of the BZN molecule. A line broadening, which points to a faster decay in Si upon clustering with the polar solvent, is observed for the BZNW cluster.

Laser two-photon ionization of aniline in a molecular beam and the bulk gas phase

1979 ◽  
Vol 67 (2-3) ◽  
pp. 351-355 ◽  
Author(s):  
John H. Brophy ◽  
Charles T. Rettner
Keyword(s):  
Gas Phase ◽  
Molecular Beam ◽  
Two Photon ◽  
Photon Ionization
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