Madhusree Roy Chowdhury

Influence of the ion charge state on emission energies of Auger electrons exemplified in Ar and Xe clusters

Niklas Golchert, Eetu Pelimanni, Nils Kiefer, Lutz Marder et autres

We report on the shift of energies released during Auger cascades in rare-gas ions, when the ions are not isolated but embedded in a homogeneous cluster. By combining high-resolution electron spectroscopy with multielectron coincidence spectroscopy of small Ar and Xe clusters, we …

de, fi, fr, se (code pays fourni par la source)

Products of Sublimated Ammonium Salts

Jean‐Christophe Loison, Madhusree Roy Chowdhury, Gustavo A. García, Kevin M. Hickson et autres

Ammonium salts are increasingly suspected to play an important role in astrochemistry, as both a reservoir, particularly of sulfur and nitrogen, and a potential source of complex molecules, in spite of the lack of knowledge on their sublimation process and products. We …

fr (code pays fourni par la source)

Photoionization and Dissociative Photoionization of Acetaldehyde in the 10.0–13.7 eV Range by Synchrotron Photoelectron Photoion Coincidence Spectroscopy

Xiangkun Wu, Cuihong Zhang, Xuejun Gu, Christa Fittschen et autres

Abstract Photoionization and dissociative photoionization of acetaldehyde (CH3CHO) in the 10.0–13.7 eV energy range are studied by using synchrotron radiation double imaging photoelectron photoion coincidence spectroscopy (i2PEPICO). The X2A′ and A2A“ electronic states of CH3CHO+ as well as the Franck‐Condon gap region …

cn, ch, fr (code pays fourni par la source)

Photoionization of Nitrile-substituted Naphthalene and Benzene: Cation Spectroscopy, Photostability, and Implications for Photoelectric Gas Heating

Madhusree Roy Chowdhury, Gustavo A. García, Helgi Rafn Hróðmarsson, Jean‐Christophe Loison et autres

Abstract We investigate the vacuum ultraviolet (VUV) photodynamics of gas phase 1- and 2-cyanonaphthalene and cyanobenzene, recently detected in the Taurus molecular cloud, by combining synchrotron radiation and a double imaging electron/ion coincidence setup. The high-resolution threshold photoelectron spectra (TPES) of all …

fr (code pays fourni par la source)

Lifetime measurement of the E = 2485.3 keV level of 25Al populated through 24Mg(p,γ)25Al resonance reaction

A. Gupta, Sathi Sharma, Sangeeta Das, Anik Adhikari et autres

in (code pays fourni par la source)

Induced photoelectron circular dichroism onto an achiral chromophore

Etienne Rouquet, Madhusree Roy Chowdhury, Gustavo A. García, Laurent Nahon et autres

An achiral chromophore can acquire a chiral spectroscopic signature when interacting with a chiral environment. This so-called induced chirality is documented in electronic or vibrational circular dichroism, which arises from the coupling between electric and magnetic transition dipoles. Here, we demonstrate that …

fr (code pays fourni par la source)

Refining the thermochemical properties of CF, SiF, and their cations by combining photoelectron spectroscopy, quantum chemical calculations, and the Active Thermochemical Tables approach

Ugo Jacovella, Branko Ruščić, Ning L. Chen, Hai Linh Le et autres

calculations, resulting in new experimental values for the adiabatic ionisation energies of both CF (9.128 ± 0.006 eV) and SiF (7.379 ± 0.009 eV). Using these values, the underlying thermochemical network of Active Thermochemical Tables was updated, providing further refined enthalpies of …

fr, us (code pays fourni par la source)

Electron emission from bromouracil and uracil induced by protons and radiosensitization

Madhusree Roy Chowdhury, J M Monti, Deepankar Misra, Philippe F. Weck et autres

Abstract Absolute double differential cross sections (DDCS) of electrons emitted from uracil and 5-bromouracil (BrU) in collisions with protons of energy 200 keV have been measured for various forward and backward emission angles over wide range of electron energies. The measured DDCS …

in, ar, us (code pays fourni par la source)

Electron emission from water vapor under the impact of 250-keV protons

Abhijeet Bhogale, Subhro Bhattacharjee, Madhusree Roy Chowdhury, Chandan Bagdia et autres

Absolute double differential cross sections (DDCS) of low-energy electron emission from water molecule were measured upon collisions with 250-keV protons for emission angles between 30--150 degrees. The electrons having energies between 1 and 600 eV were detected by using hemispherical electrostatic analyzer. …

in, ar, es, ca (code pays fourni par la source)

What circular dichroism spectroscopy teaches us about solvation

Sascha Jähnigen, Jessica Bowles, Jennifer Dupont, Sébastien Hartweg et autres

National audience

fr (code pays fourni par la source)

Electron emission from fluorene (C 13 H 10 ) upon 3.5 MeV/u Si 8+ ion impact: double differential distributions

Chandan Bagdia, Anuvab Mandal, Madhusree Roy Chowdhury, Shamik Bhattacharjee et autres

Abstract We have studied the electron emission from one of the polycyclic aromatic hydrocarbon (PAH) molecules namely, fluorene (C 13 H 10 ), upon 3.5 MeV/u Si 8+ ion impact. The experimentally measured absolute double differential cross sections (DDCS) are compared with …

in, fr, hu, us (code pays fourni par la source)

Radiobiological effectiveness of iodouracil and the influence of atomic giant resonance

Anuvab Mandal, Madhusree Roy Chowdhury, Chandan Bagdia, J M Monti et autres

Hadron therapy combined with nanotechnology has been proposed as an elegant alternative for cancer treatment. Internal amplification of electron emission causing radiobiological effectiveness in nanoinserted biomolecules is of prime importance and has been measured here for the iodouracil molecule. Our experiment involves …

in, ar, us (code pays fourni par la source)