Theoretical and experimental study of infrared spectra of He2-CO2This article is part of a Special Issue on Spectroscopy at the University of New Brunswick in honour of Colan Linton and Ron Lees.

2009 ◽  
Vol 87 (5) ◽  
pp. 417-423 ◽  
Author(s):  
Jian Tang ◽  
A. R.W. McKellar ◽  
Xiao-Gang Wang ◽  
Tucker Carrington
Keyword(s):  
Energy Levels ◽  
Supersonic Jet ◽  
Rotational States ◽  
Vibrational Ground State ◽  
Supersonic Jet Expansion ◽  
Theoretical Line ◽  
The University ◽  
Line Positions ◽  
Good Agreement ◽  
Pulsed Supersonic Jet

Additional high-resolution lines in the ν3 CO2 fundamental band of the rovibrational spectrum of He2-CO2 have been observed using a tunable infrared laser to probe a pulsed supersonic jet expansion. The ro-vibrational spectrum was calculated using Euler angles and five vibrational coordinates that specify the positions of the He atoms with respect to the CO2 molecule, a product basis, and a Lanczos eigensolver. Rotational states with J = 0, 1, 2, and 3 associated with the vibrational ground state and different states (νt) of the torsional motion of the two He atoms about the CO2 axis are identified and assigned. The assignment is consistent with having different principle axis orientiations in νt = 0 and νt = 1 states. Δνt = 1 infrared transistions are forbidden due to the symmetry of CO2, but Δνt = 1 microwave transistions are possible. Theoretical line positions and intensities are predicted. Good agreement between experiment and theory was obtained. The calculated energy levels and intensities were crucial in assigning some of the weaker observed transitions.

Strain Effects in the Paraelectric Resonance of KCl: Li

1973 ◽  
Vol 28 (6) ◽  
pp. 938-952 ◽  
Author(s):  
B. Dischler
Keyword(s):  
Dipole Moment ◽  
Electric Fields ◽  
Electric Dipole ◽  
Zero Field ◽  
Host Crystal ◽  
Tunneling Model ◽  
Theoretical Line ◽  
Line Positions ◽  
Internal Strains ◽  
Good Agreement

The effects of random internal strains on the paraelectric resonance spectra for off-center Li in KCl are investigated quantitatively. Diagrams giving the theoretical line positions and relative intensities are presented for the principal orientations 〈100〉, 〈110〉, and 〈111〉. Where the model for an ideal host crystal predicts only one line, up to six lines are obtained in the present calcula­tion. A direct comparison with the published experimental spectra, taken at 9, 24, 29, 35, 63 and 74 GHz is performed. Very good agreement is found and the magnitude of internal strain has been inferred, yielding values between 18 and 42 bar for different samples. Random internal electric fields are found to be of the order 3kV/cm. For the halfwidth of the main signal, the orientation and frequency dependence is examined and explained by the calculations. The possible use of paraelectric Li as a microprobe for internal strains and internal electric fields in KCl is discussed. The electric dipole moment of Li7 is found to be 5.9±0.3 Debye in agreement with previous deter­minations. The “cube edge” tunneling model with equidistant zero field levels, separated by 22.2 GHz for Li7, is fully confirmed.

Fourier transform microwave observation of SO (X 3Σ, v=0–2) produced by 193 nm photodissociation of SO2 in a pulsed supersonic jet expansion

1998 ◽  
Vol 289 (3-4) ◽  
pp. 311-318 ◽  
Author(s):  
N. Hansen ◽  
U. Andresen ◽  
H. Dreizler ◽  
J.-U. Grabow ◽  
H. Mäder ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Supersonic Jet ◽  
Supersonic Jet Expansion ◽  
193 Nm ◽  
Microwave Observation ◽  
Pulsed Supersonic Jet

ROTATIONAL STATES IN DEFORMED EVEN–EVEN NUCLEI

1967 ◽  
Vol 45 (11) ◽  
pp. 3521-3532 ◽  
Author(s):  
Raj K. Gupta
Keyword(s):  
Energy Levels ◽  
Spin States ◽  
Coupling Constant ◽  
Rotational States ◽  
Rotational Bands ◽  
High Spin States ◽  
Oscillator Type ◽  
The Moment ◽  
Vibration Coupling ◽  
Good Agreement

The deviations from the simple I(I + 1) dependence of the energy levels in the ground-state rotational bands on the hydrodynamical model of Bohr and Mottelson have been investigated for both regions of stable deformation. An interpretation of high spin states is looked for in terms of a nonrigid rotator with vibrations (harmonic oscillator type) taken as perturbation. In the framework of this model, the energy expression is obtained as a power series in the product of the ratio B/A and the weight factor I(I + 1), where A is related to the moment of inertia and B is the rotation–vibration coupling constant. The calculations are shown to be in good agreement with the experimental data.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

scholarly journals Experimental Methods for Measuring the Viscous Friction Coefficient in Hydraulic Spool Valves

2021 ◽  
Vol 13 (13) ◽  
pp. 7174
Author(s):  
Massimo Rundo ◽  
Paolo Casoli ◽  
Antonio Lettini
Keyword(s):  
Friction Coefficient ◽  
Viscous Friction ◽  
Experimental Tests ◽  
Experimental Methods ◽  
Displacement Transducer ◽  
A Posteriori ◽  
Displacement Control ◽  
Spool Valves ◽  
The University ◽  
Good Agreement

In hydraulic components, nonlinearities are responsible for critical behaviors that make it difficult to realize a reliable mathematical model for numerical simulation. With particular reference to hydraulic spool valves, the viscous friction coefficient between the sliding and the fixed body is an unknown parameter that is normally set a posteriori in order to obtain a good agreement with the experimental data. In this paper, two different methodologies to characterize experimentally the viscous friction coefficient in a hydraulic component with spool are presented. The two approaches are significantly different and are both based on experimental tests; they were developed in two distinct laboratories in different periods of time and applied to the same flow compensator of a pump displacement control. One of the procedures was carried out at the Fluid Power Research Laboratory of the Politecnico di Torino, while the other approach was developed at the University of Parma. Both the proposed methods reached similar outcomes; moreover, neither method requires the installation of a spool displacement transducer that can significantly affect the results.

Systematic calculations of energy levels and transitions rates in Mo XXVIII

2020 ◽  
Vol 75 (8) ◽  
pp. 739-747
Author(s):  
Feng Hu ◽  
Yan Sun ◽  
Maofei Mei
Keyword(s):  
Energy Levels ◽  
Oscillator Strengths ◽  
Atomic Data ◽  
Data Sets ◽  
Electron Systems ◽  
Excitation Energies ◽  
Experimental Values ◽  
Qed Effects ◽  
Hyperfine Structures ◽  
Good Agreement

AbstractComplete and consistent atomic data, including excitation energies, lifetimes, wavelengths, hyperfine structures, Landé gJ-factors and E1, E2, M1, and M2 line strengths, oscillator strengths, transitions rates are reported for the low-lying 41 levels of Mo XXVIII, belonging to the n = 3 states (1s22s22p6)3s23p3, 3s3p4, and 3s23p23d. High-accuracy calculations have been performed as benchmarks in the request for accurate treatments of relativity, electron correlation, and quantum electrodynamic (QED) effects in multi-valence-electron systems. Comparisons are made between the present two data sets, as well as with the experimental results and the experimentally compiled energy values of the National Institute for Standards and Technology wherever available. The calculated values including core-valence correction are found to be in a good agreement with other theoretical and experimental values. The present results are accurate enough for identification and deblending of emission lines involving the n = 3 levels, and are also useful for modeling and diagnosing plasmas.

The Brazilian AMS Radiocarbon Laboratory (LAC-UFF) and the Intercomparison of Results with CENA and UGAMS

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 325-330 ◽  
Author(s):  
K D Macario ◽  
P R S Gomes ◽  
R M Anjos ◽  
C Carvalho ◽  
R Linares ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Latin America ◽  
Liquid Scintillation Counting ◽  
Nuclear Energy ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Physics Institute ◽  
University Of Georgia ◽  
The University ◽  
Good Agreement

After 22 yr of the low-level liquid scintillation counting 14C laboratory at the Center for Nuclear Energy in Agriculture (CENA) at São Paulo University (USP), Piracicaba, Brazil, and several collaborative projects with Brazilian and international researchers from distinct scientific areas, the first 14C accelerator mass spectrometry (AMS) laboratory in Latin America was installed at the Physics Institute of the Universidade Federal Fluminense (UFF), Niterói, Brazil. A 250kV single stage accelerator produced by National Electrostatics Corporation began its operation in 2012. In this work, we compare measurements performed at the AMS Radiocarbon Laboratory at UFF (LAC-UFF) with those performed at CENA and the University of Georgia (UGAMS), Georgia, USA. All the results obtained from distinct inorganic and organic samples were in very good agreement.

Rotational States of NH+4in Dilute Solution in Alkali Halide Lattices. III. Calculated Energy Levels of NH+4in KBr

1985 ◽  
Vol 54 (7) ◽  
pp. 2595-2602 ◽  
Author(s):  
Yoshiaki Ozaki ◽  
Kazuo Maki ◽  
Kenkichi Okada ◽  
James A. Morrison
Keyword(s):  
Alkali Halide ◽  
Energy Levels ◽  
Dilute Solution ◽  
Rotational States ◽  
Calculated Energy

A New Liquid Droplet Laser Desorption Source Combined with Supersonic Jet Expansion: Application to Phenol and its Water Clusters

2014 ◽  
Vol 228 (4-5) ◽  
Author(s):  
Chayan Kanti Nandi ◽  
Hans-Dieter Barth ◽  
Bernhard Brutschy
Keyword(s):  
Gas Phase ◽  
Water Clusters ◽  
Liquid Droplet ◽  
Supersonic Jet ◽  
Laser Desorption ◽  
Laser Source ◽  
Published Data ◽  
Two Photon ◽  
Supersonic Jet Expansion ◽  
Phase Out

AbstractWe have developed a new laser source, for the spectroscopy of nonvolatile molecules in gas phase. It is based on a laser induced liquid bead ion desorption source (LILBID) combined with a supersonic beam. The cold molecules produced with this technique are sampled with Resonant Two Photon Ionization spectroscopy (R2PI) to measurement of the gas phase optical spectra. LILBID allows to bring nonvolatile molecule from liquid phase (out of a droplet) into gas phase, by means of multi photon ablation with IR photons exciting the vibrations of the solvent. Phenol and its different water clusters have been used as an example to demonstrate the method and to standardise the new experimental setup. The recorded R2PI spectral data of phenol monomer and its different water clusters obtained from this laser desorption technique are in very good agreement with the previously published data. This technique opens a new door for the measurement of molecules under microsolvation and potentially for

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