Electronic structure of arsabenzene: Microwave spectrum, dipole moment, and nuclear quadrupole coupling constants

The microwave spectrum of arsabenzene was analyzed; a dipole transitions were observed. The following rotational constants were obtained; A = 4871.03 +/- 0.18 MHz, B = 2295.87 +/- 0.01 MHz, C = 1560.10 +/- 0.01 MHz. The dipole moment was 1.10 +/- 0.04 D. The nuclear quadrupole coupling constants due to the 75As nucleus were [chi]aa = -186.4 +/- 0.1 MHz, [chi]bb = 43.5 +/- 0.2 MHz, [chi]cc = 142.9 +/- 0.2 MHz, and the asymmetry parameter, [eta] = 0.533 +/- 0.002. Analysis of the quadrupole coupling constants indicated that the population of the 4p orbitals on arsenic decrease in the order na > nb > nc.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/22180/1/0000611.pd

The microwave spectrum, structure and dipole moment of 1,4-pentadiyne

The microwave spectra of 1,4-pentadiyne and 1,4-pentadiyne-1,5-d2 are assigned and rotational and centrifugal distortion constants obtained. A unique structure could not be determined. However, analysis of the moments of inertia indicates that the bond distances in C5H4 are close to typical values found in other related compounds. An interaction involving the acetylene moieties is evidenced by the derived bond angles. The data are consistent with either the central CCC angle being close to the tetrahedral value with the acetylene groups pushed away from linearity by approximately 3-4[deg] or opening of the central CCC angle to about 113[deg] along with linear acetylene groups. A range of structures between these two is also possible. The dipole moment is determined to be 0.516(5) D.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/24440/1/0000713.pd

Reaction rates and transport in neutron stars

Understanding signals from neutron stars requires knowledge about the transport inside the star. We review the transport properties and the underlying reaction rates of dense hadronic and quark matter in the crust and the core of neutron stars and point out open problems and future directions.Comment: 74 pages; commissioned for the book "Physics and Astrophysics of Neutron Stars", NewCompStar COST Action MP1304; version 3: minor changes, references updated, overview graphic added in the introduction, improvements in Sec IV.A.

Corrigendum to "European Society for Vascular Surgery (ESVS) 2022 Clinical Practice Guidelines on the Management of Chronic Venous Disease of the Lower Limbs. [Eur J Vasc Endovasc Surg (2022) 63, 184-267]"

proofepub_ahead_of_prin

Editor's Choice – European Society for Vascular Surgery (ESVS) 2022 Clinical Practice Guidelines on the Management of Chronic Venous Disease of the Lower Limbs

Corrigendum: Volume 64, Issues 2–3, 2022, 284-285Peer reviewe

Long Range Plan: Dense matter theory for heavy-ion collisions and neutron stars

Since the release of the 2015 Long Range Plan in Nuclear Physics, major events have occurred that reshaped our understanding of quantum chromodynamics (QCD) and nuclear matter at large densities, in and out of equilibrium. The US nuclear community has an opportunity to capitalize on advances in astrophysical observations and nuclear experiments and engage in an interdisciplinary effort in the theory of dense baryonic matter that connects low- and high-energy nuclear physics, astrophysics, gravitational waves physics, and data scienceComment: 70 pages, 3 figures, White Paper for the Long Range Plan for Nuclear Scienc

THE MICROWAVE SPECTRUM AND CONFORMATION OF VINYL FULORIDE OZONIDE

Author Institution: Department of Chemistry, University of MichiganThe spectra of the ground state and two excited vibrational states of vinyl fluoride ozonide $\bar{(CH_{2}OOCHFO)}$ have been assigned. Ground state rotational constants (MHz) are: $A = 6774.04 \pm\ 0.02, B = 3916.32 \pm 0.01$ and $C = 3122.66 \pm 0.01$. Dipole moment components are $\mu_{a} = 1.46 \pm 0.01$D, $\mu_{b} = 1.35 \pm 0.03$D, $\mu_{c} = 1.20 \pm 0.01$D and $\mu_{T} = 2.32 \pm 0.02$D. The data are consistent with a O-O half-chair conformation with the fluorine atom in an axial position. This is in contrast to previous structural studies of methylated ozonides in which methyl groups were found only at equatorial sites

MICROWAVE SPECTROSCOPIC STUDY OF THE ROTATIONAL ISOMERS OF METHYL HYDRAZINE

Author Institution: Department of Chemistry, University of KansasThe microwave spectra of two rotameric forms of methyl hydrazine have been observed and analyzed. By means of the measured rotational constants and electric dipole moments it is possible to make a reasonable assignment of the spectra to the expected “inner” and “outer” unsymmetrical rotamers. Contrary to previous assumptions, the spectroscopic evidence shows the “inner” isomer to be the more stable. The spectrum of each isomer shows prominent inversion doubling. For the more stable isomer the $N^{14}$ hyperfine structure has been analyzed and the barrier to internal rotation of the methyl group has been determined to be $1328 \pm 20 cm^{-1}$