Many modern theories predict that the fundamental constants depend on time, position or the local density of matter. Here we develop a spectroscopic method for pulsed beams of cold molecules, and use it to measure the frequencies of microwave transitions in CH with accuracy down to 3 Hz. By comparing these frequencies with those measured from sources of CH in the Milky Way, we test the hypothes...

Nicole Brimhall, Nicholas Herrick, David D. Allred, R. Steven Turley, Michael Ware, and Justin Peatross∗ Department of Physics and Astronomy, Provo, UT 84602 and ∗Corresponding author: [email protected] Abstract We use a laser-high-harmonics-based extreme ultraviolet polarimeter to determine the optical constants of elemental uranium in the wavelength range 10-47 nm. The constants are extracted from...

DFT(B3LYP, B3PW91) calculations in conjunction with three different basis sets have been utilized to investigate the variations in the bond lengths, dipole moment, rotational constants, IR frequencies, IR intensities and rotational invariants of ClCCCN. The nuclear quadrupole constants of chlorine ((35)Cl, (37)Cl) and nitrogen ((14)N) of ClCCCN have been calculated on the experimental r(s) stru...

The binding behavior of a competitive inhibitor, N-phenylbenzhydroxamic acid (BHA) against horseradish peroxidase (HRP) was studied in order to understand and predict the interaction mechanism of hydrogen donors with the enzyme. The dissociation constants of the complexes of HRP-BHA, HRP-donor and HRP-BHA-azide were estimated at specified conditions by difference spectroscopy. The binding s...

The paper reports main results of a comprehensive study of the vibrational spectrum of ketene computed using second-order perturbation theory treatment based on quartic, cubic and semidiagonal quartic force constants. Two different models--a homogeneous model using the same density functionals and basis functions for the harmonic calculations and anharmonic corrections, and a hybrid model in wh...

Accurate spectroscopic constants and electrical properties of small molecules are determined by means of W4 and post-W4 theories. For a set of 28 first- and second-row diatomic molecules for which very accurate experimental spectroscopic constants are available, W4 theory affords near-spectroscopic or better predictions. Specifically, the root-mean-square deviations (RMSDs) from experiment are ...

In this paper, electronic, structural, and spectroscopic properties of mono-, di-, tri-, andtetrafluorothiophenes and their radical cations are studied using the density functional theory andB3LYP method with 6-311++G** basis set. Also the effects of the number and position of thesubstituent on the electrochemical properties of the thiophene ring have been studied usingoptimized structures obta...

Recent advances in spectroscopic instrumentation and calibration methods dramatically improve the quality of quasar spectra. Supercomputer calculations show that, at high spectral resolution, procedures used some previous analyses spacetime variations fundamental constants are likely to generate spurious measurements, biased systematically towards a null result. Developments analysis also summa...

The study of the properties doubly heavy baryons represents a promising area in particle physics. It can provide us with information about Cabibbo-Kobayashi-Maskawa (CKM) matrix elements and low energy dynamics QCD. They have very rich phenomenology. investigation weak, electromagnetic, strong decays has vital importance for understanding baryons. main ingredients such studies are spectroscopic...

The spectroscopic hyperfine constants for all the alkali atoms are reported. For from lithium to cesium, only long lived atomic isotopes examined. francium, measured data nuclear ground states of available listed. All results obtained since beginning laser investigations presented, while previous works Arimondo et al. [Rev. Mod. Phys. 49, 31 (1977)] recalled. Global analyses based on scaling la...