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Fourier-transform spectroscopy and global deperturbation treatment of the A1Σu+ and b3Πu states of K2 in the entire bound energy range.
J Chem Phys
February 2024
Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia.
Rotationally resolved Fourier-transform spectra of laser-induced fluorescence A1Σu+∼b3Πu→X1Σg+ of K2 molecules were recorded and analyzed, yielding 4053 term values of the spin-orbit (SO) coupled A ∼ b complex of the 39K2 isotopologue with ∼0.01 cm-1 accuracy. Their compilation with 1739 term values from previously published sources allowed them to cover the energy range [9955, 17 436] cm-1 from the bottom of the lower-lying b3Πu state up to the vicinity of the atomic asymptote 4s2S12 + 4p2P12, with a rotational quantum number J ∈ [0, 149].
View Article and Find Full Text PDFStudy of Quasielastic Barrier Distributions as a Step towards the Synthesis of Superheavy Elements with Hot Fusion Reactions.
Phys Rev Lett
February 2020
Department of Physics, Tohoku University, Sendai 980-8578, Japan.
The excitation functions for quasielastic scattering of ^{22}Ne+^{248}Cm, ^{26}Mg+^{248}Cm, and ^{48}Ca+^{238}U are measured using a gas-filled recoil ion separator. The quasielastic barrier distributions are extracted for these systems and are compared with coupled-channel calculations. The results indicate that the barrier distribution is affected dominantly by deformation of the actinide target nuclei, but also by vibrational or rotational excitations of the projectile nuclei, as well as neutron transfer processes before capture.
View Article and Find Full Text PDFPredissociation of the B Σu-3 state of S: A coupled-channel model.
J Chem Phys
June 2018
Department of Physics, Wellesley College, Wellesley, Massachusetts 02481, USA.
A coupled-channel Schrödinger equation model of predissociation in the B Σu-3 state of S is developed and optimized by comparison with recent photoabsorption spectra of the B Σu-3-X Σg-3(v,0) bands for 11 ≤ v ≤ 27, covering the energy range 35 800-41 500 cm. All bands in this range exhibit varying degrees of diffuseness, with corresponding predissociation linewidths Γ ≈ 4-60 cm full-width at half-maximum. Model comparisons with both low-temperature (T = 370 K) and high-temperature (T = 823 K) spectra indicate, for many bands, significant dependence of the linewidth on both the rotational quantum number J and the fine-structure component F.
View Article and Find Full Text PDFPhotoproduction of π0 mesons off neutrons in the nucleon resonance region.
Phys Rev Lett
April 2014
Department of Physics, University of Basel, Switzerland.
Article Synopsis
- Precise angular distributions for π0 meson photoproduction off neutrons in deuterons were measured for the first time, eliminating effects from nuclear Fermi motion through complete kinematic reconstruction.
- Final-state interaction effects were assessed by comparing reaction cross sections for quasifree protons in deuterons to those of free protons, applied as a correction to the quasifree neutron findings.
- Results from the experiment at the Mainz Microtron MAMI revealed significant discrepancies in model predictions, providing important constraints for future analyses, particularly within the Bonn-Gatchina coupled-channel framework.
Quantum dynamics of the reaction H((2)S) + HeH(+)(X(1)Σ(+)) → H2(+)(X(2)Σg(+)) + He((1)S) from cold to hyperthermal energies: time-dependent wavepacket study and comparison with time-independent calculations.
J Phys Chem A
August 2014
Departament de Quı́mica Fı́sica, Institut de Quı́mica Teòrica i Computacional, Universitat de Barcelona, C/Martı́ i Franquès 1, 08028 Barcelona, Spain.
We present the adiabatic quantum dynamics of the proton-transfer reaction H((2)S) + HeH(+)(X(1)Σ(+)) → H2(+)(X(2)Σg(+)) + He((1)S) on the HeH2(+) X̃(2)Σ(+) RMRCI6 (M = 6) PES of C. N. Ramachandran et al.
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