52 research outputs found
Critical revision of the ZEPLIN-I sensitivity to WIMP interactions
The ZEPLIN collaboration has recently published its first result presenting a
maximum sensitivity of picobarn for a WIMP mass of
60 GeV. The analysis is based on a discrimination method using the
different time distribution of scintillation light generated in electron recoil
and nuclear recoil interactions. We show that the methodology followed both for
the calibration of the ZEPLIN-I detector response and for the estimation of the
discrimination power is not reliable enough to claim any background
discrimination at the present stage. The ZEPLIN-I sensitivity appears then to
be in the order of 10 picobarn, three orders of magnitude above the
claimed 1.1 10 picobarn.Comment: 8 pages, 4 figures, minor corrections, two references updated, final
version accepted in Physics Letters
On the Participation of Photoinduced N–H Bond Fission in Aqueous Adenine at 266 and 220 nm: A Combined Ultrafast Transient Electronic and Vibrational Absorption Spectroscopy Study
Exploring the Energy Disposal Immediately After Bond-Breaking in Solution: The Wavelength-Dependent Excited State Dissociation Pathways of para
Ultrafast Internal Conversion of Excited Cytosine via the Lowest ππ* Electronic Singlet State
Ultrafast intersystem crossing of 4-Thiothymidine inaqueous solution
Ultrafast intersystem crossing of UVA-sensitive 4-thiothymidine in aqueous solution was investigated by pump?probe transient absorption. 4-Thiothymidine in the excited singlet state exhibited a distinctively different photophysical pathway from that of thymidine, with intersystem crossing to the triplet manifold being dominant and the triplet formation being completed within approximately 10 ps. This was further supported by quantum chemical calculations. We propose that the unique behavior of photoexcited 4-thiothymidine results from its distinctive molecular and electronic structures and that the triplet form is the initial toxic source to DNA and other biomolecules
Photophysics of the π,π* and n,π* States of Thymine: MS-CASPT2 Minimum-Energy Paths and CASSCF on-the-Fly Dynamics
Density Functional Study of Intradimer Proton Transfers in Hydrated Adenine Dimer Ions, A 2
Excited-State Dynamics of Nitrated Push−Pull Molecules: The Importance of the Relative Energy of the Singlet and Triplet Manifolds
- …