6,432 research outputs found
On the vibronic level structure in the NO_3 radical. Part III. Observation of intensity borrowing via ground state mixing
The A^2E" ← X^2A'_2 absorption spectrum exhibits vibronically allowed transitions from the
ground state of NO_3 to upper state levels having a"_1 and e' vibronic symmetries. This paper
explores the coupling mechanisms that lend intensities to these features. While transitions to e'
vibronic levels borrow intensity from the very strong B^2E' ← X^2A'_2 electronic transition, those to
a"_1 levels involve only negligible upper-state borrowing effects. Rather, it is the vibronic mixing of
the ground vibronic level of NO_3 with vibrational levels in the B^2E' electronic state that permit
the a"_1 levels to be seen in the spectrum. These ideas are supported by vibronic coupling
calculations. The fact that the intensities of features corresponding to the two different vibronic
symmetries are comparable is thus accidental
New insights into the Jahn–Teller effect in NO_3 via the dark à 2E" state
The recent cavity ringdown (CRD) measurement of the forbidden Ã^2 E"←X~^2 A2' transition of the nitrate radical NO_3 reveals a rich, well-resolved spectrum in the near-infrared. The spectroscopic detail provides a new window onto the Jahn–Teller (JT) and pseudo-Jahn–Teller (PJT) effects in NO_3. This paper reviews the current experimental evidence for vibronic coupling in the à state and discusses the theoretical issues in the context of new preliminary EOMIP/CCSD and CCSD(T) calculations. The theoretical results to date indicate that the à 2E" state of NO_3 undergoes a relatively strong JT distortion which may require inclusion of higher order vibronic couplings. The intensity of this transition may involve multiple intensity borrowing mechanisms via PJT coupling among the X~, à and B~ states
TeV Scale Mirage Mediation and Natural Little SUSY Hierarchy
TeV scale mirage mediation has been proposed as a supersymmetry breaking
scheme reducing the fine tuning for electroweak symmetry breaking in the
minimal supersymmetric extension of the standard model. We discuss a moduli
stabilization set-up for TeV scale mirage mediation which allows an
extra-dimensional interpretation for the origin of supersymmetry breaking and
naturally gives an weak-scale size of the Higgs B-parameter. The set-up
utilizes the holomorphic gauge kinetic functions depending on both the heavy
dilaton and the light volume modulus whose axion partners are assumed to be
periodic fields. We also examine the low energy phenomenology of TeV scale
mirage mediation, particularly the constraints from electroweak symmetry
breaking and FCNC processes.Comment: 44 pages, 14 figures; added references, extended discussions in
section
Citrullinated fibrinogen shows defects in FPA and FPB release and fibrin polymerization catalyzed by thrombin
ArticleClinica Chimica Acta. 401(1-2):119-123 (2009)journal articl
Residue gamma 153Cys is essential for the formation of the complexes A alpha gamma and B beta gamma, assembly intermediates for the A alpha B beta gamma complex and intact fibrinogen
ArticleCLINICA CHIMICA ACTA. 353(1-2): 157-164 (2005)journal articl
Direct measurements of DOCO isomers in the kinetics of OD+CO
Quantitative and mechanistically-detailed kinetics of the reaction of
hydroxyl radical (OH) with carbon monoxide (CO) have been a longstanding goal
of contemporary chemical kinetics. This fundamental prototype reaction plays an
important role in atmospheric and combustion chemistry, motivating studies for
accurate determination of the reaction rate coefficient and its pressure and
temperature dependence at thermal reaction conditions. This intricate
dependence can be traced directly to details of the underlying dynamics
(formation, isomerization, and dissociation) involving the reactive
intermediates cis- and trans-HOCO, which can only be observed transiently.
Using time-resolved frequency comb spectroscopy, comprehensive mechanistic
elucidation of the kinetics of the isotopic analogue deuteroxyl radical (OD)
with CO has been realized. By monitoring the concentrations of reactants,
intermediates, and products in real-time, the branching and isomerization
kinetics and absolute yields of all species in the OD+CO reaction are
quantified as a function of pressure and collision partner.Comment: 19 pages, 4 figure
Near-infrared and Millimeter Constraints on the Nuclear Energy Source of the Infrared Luminous Galaxy NGC 4418
We present near-infrared and millimeter investigations of the nucleus of the
infrared luminous galaxy NGC 4418, which previous observations suggest
possesses a powerful buried AGN. We found the following main results: (1) The
infrared K-band spectrum shows CO absorption features at 2.3-2.4 micron owing
to stars and very strong H2 emission lines. The luminosity ratios of H2
emission lines are suggestive of a thermal origin, and the equivalent width of
the H2 1-0 S(1) line is the second largest observed to date in an external
galaxy, after the well-studied strong H2-emitting galaxy NGC 6240. (2) The
infrared L-band spectrum shows a clear polycyclic aromatic hydrocarbon (PAH)
emission feature at 3.3 micron, which is usually found in star-forming
galaxies. The estimated star-formation luminosity from the observed PAH
emission can account for only a small fraction of the infrared luminosity. (3)
Millimeter interferometric observations of the nucleus reveal a high HCN (1-0)
to HCO+ (1-0) luminosity ratio of 1.8, as has been previously found in pure
AGNs. (4) The measurements of HCN (1-0) luminosity using a single-dish
millimeter telescope show that the HCN (1-0) to infrared luminosity ratio is
slightly larger than the average, but within the scattered range, for other
infrared luminous galaxies. All of these results can be explained by the
scenario in which, in addition to energetically-insignificant, weakly-obscured
star-formation at the surface of the nucleus, a powerful X-ray emitting AGN
deeply buried in dust and high density molecular gas is present.Comment: 31 pages, 9 figures, Accepted for publication in Astronomical Journal
(2004 November issue
Substitution of the gamma-chain Asn308 disturbs the D : D interface affecting fibrin polymerization, fibrinopeptide B release, and FXIIIa-catalyzed cross-linking
This research was originally published in Blood. Authors. Okumura, N; Gorkun, OV; Terasawa, F; Lord, ST Title. Blood. 2004; 103(12): 4157-4163. © by the American Society of Hematology.ArticleBLOOD. 103(11): 4157-4163 (2004)journal articl
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