52 research outputs found
Enhanced nuclear spin dependent parity violation effects using the 199HgH molecule
Electron interactions with the nuclear-spin-dependent (NSD) parity
non-conserving (PNC) anapole moment are strongly enhanced within heteronuclear
diatomic molecules. A novel, low-energy optical rotation experiment is being
proposed with the aim of observing NSD PNC interactions in HgH. Based on the
relativistic coupled cluster method we present a complete calculation of the
circular polarization parameter for the optical
transition of HgH, where is a dimensionless constant determined by the
nuclear anapole moment. This provides an improvement in sensitivity to NSD PNC
by 2 -- 3 orders of magnitude over the leading atomic Xe, Hg, Tl, Pb and Bi
optical rotation experiments, and shows that the proposed measurement will be
sensitive enough to extract the Hg anapole moment and shed light on the
underlying theory of hadronic parity violation
Stark shift and parity non-conservation for near-degenerate states of xenon
We identify a pair of near-degenerate states of opposite parity in atomic Xe,
the 5p^5 10s \,\, ^2[3/2]_2^o at cm and 5p^5 6f
\,\, ^2[5/2]_2 at cm, for which parity- and
time-odd effects are expected to be enhanced by the small energy separation. We
present theoretical calculations which indicate narrow widths for both states
and we report a calculated value for the weak matrix element, arising from
configuration mixing, of Hz for Xe. In addition, we measured
the Stark effect of the and
() states. The Stark-shift of the states
is observed to be negative, revealing the presence of nearby states at
higher energies, which have not been observed before. The Stark-shift
measurements imply an upper limit on the weak matrix element of Hz
for the near-degenerate states (10s \,\, ^2[3/2]_2^o and 6f \,\,
^2[5/2]_2), which is in agreement with the presented calculations.Comment: 11 pages, 6 figure
Determination of the Barrier Height for Acetyl Radical Dissociation from Acetyl Chloride Photodissociation at 235 nm Using Velocity Map Imaging
Control charts to monitor integer valued autoregressive process with inflation or deflation of zeros
Interpretation of Biphasic Protein Modification and Modification-Induced Enzyme Inactivation Reaction Plots
Absolute absorption cross-section measurements of CO2 in the ultraviolet from 200 to 206 nm at 295 and 373 K
Laboratory measurements of the absolute absorption cross-section of CO 2 at the temperatures 295 and 373 K have been made between 200 and 206 nm using cavity ring-down spectroscopy. Below 205 nm, the cross-section at 373 K is significantly larger than at 295 K, whereas beyond 205 nm measurements at both temperatures yield cross-sections approximately equal to the Rayleigh scattering cross-section, within experimental error. The present measurements should resolve a long-standing discrepancy between previously published data on this system. © 2004 Elsevier B.V. All rights reserved
- …