THE COLLISION-INDUCED FUNDAMENTAL AND FIRST OVERTONE BANDS OF OXYGEN AND NITROGEN

1966 ◽  
Vol 44 (5) ◽  
pp. 949-963 ◽  
Author(s):  
M. M. Shapiro ◽  
H. P. Gush
Keyword(s):  
Quadrupole Moment ◽  
Internuclear Distance ◽  
First Derivative ◽  
A Value ◽  
Integrated Intensities

The collision-induced rotation–vibration fundamental and first overtone bands of oxygen and nitrogen have been observed in the pure gas at pressures of a few atmospheres, and in mixtures of these gases with argon at pressures of a few tens of atmospheres. From the integrated intensities of the bands it is possible to deduce a value for the first derivative of the quadrupole moment with respect to internuclear distance; we find that |Q′| = 1.6ea0 for oxygen, and |Q′| = 0.95ea0 for nitrogen.

Far-infrared collision-induced absorption in compressed gaseous polar linear molecules: application to N2O

1988 ◽  
Vol 66 (1) ◽  
pp. 7-10 ◽  
Author(s):  
Nguyen- Van-Thanh ◽  
I. Rossi
Keyword(s):  
Quadrupole Moment ◽  
Far Infrared ◽  
Pressure Data ◽  
Induced Absorption ◽  
A Value ◽  
Induced Dipole ◽  
Linear Molecules ◽  
Bimolecular Collisions ◽  
Integrated Intensities ◽  
Rotational Interaction

This paper deals with computations of the far-infrared collision-induced absorptions for polar linear molecules. We have considered Frost's theory for dipole- and quadrupole-induced dipole absorptions in bimolecular collisions, taking the anisotropy of the molecular polarizability into account. In addition to the induced rotational interaction, a translational effect may not be negligible. Detailed expressions for different contributions to the integrated intensities are reported for N2O. Using these calculated expressions and the moderately low pressure data, we have deduced a value for the quadrupole moment of N2O, [Formula: see text].

scholarly journals NMR-Spectrometric Determination of the Fragmented Oil Composition from the Karazhanbas and Zhangurshi Oil Deposits

2018 ◽  
Vol 20 (3) ◽  
pp. 229
Author(s):  
D.U. Bodykov ◽  
T.M. Seilkhanov ◽  
M. Nazhipkyzy ◽  
A.S. Toylybayev ◽  
R. Salakhov
Keyword(s):  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
High Viscosity ◽  
Oil Composition ◽  
Alkyl Chains ◽  
H Nmr ◽  
A Value ◽  
Heavy Oil Residues ◽  
Before And After ◽  
Integrated Intensities

The methods of 1 H, 13C NMR-spectroscopy were used to study the fragmentary compositions of oil from the Karazhanbas, Zhangurshi deposits (Kazakhstan) and heavy oil residues obtained before and after the electrohydraulic effect of water hammer after topping a light fraction of oil products. Their fragmentary composition were determined by the value of integrated intensities of 1 H, 13C NMR signals of the oil under study. The obtained results have shown that the composition of oil samples understudy includes terminal CH3-groups of long alkyl chains having a value of 0.87 ppm. The presence of long alkyl chains of oil components imparts a high viscosity and bituminous consistency to the latter. The content of aromatic protons according to the integrated intensities of 1 H NMR in both oil samples does not exceed 2.08%; but there are no aromatic nuclei by the integral intensities of carbon atoms at all. The low content of protons of Hα-type in hydrocarbon crude (5.2–5.3%) indicates a low content of aromatic and carbonyl carbons as well as heteroatoms in the studied samples. The content of the greater proportion of protons of the Hγ-type in Karazhanbas oil (33.0%) compared to the Zhangurshi oil (23.8%) indicates a greater length of aliphatic hydrocarbons of the latter and its increased viscosity.

scholarly journals Inflation constraints for classes of f(R) models

2018 ◽  
Vol 15 (12) ◽  
pp. 1850209
Author(s):  
Joseph Ntahompagaze ◽  
Jean Damascène Mbarubucyeye ◽  
Shambel Sahlu ◽  
Amare Abebe
Keyword(s):  
Scalar Field ◽  
Early Universe ◽  
First Derivative ◽  
A Value ◽  
Slow Roll ◽  
Theories Of Gravity ◽  
Text Model ◽  
Definition Of ◽  
Inflationary Parameters

In this paper, we explore the equivalence between two theories, namely [Formula: see text] and scalar–tensor theories of gravity. We use this equivalence to explore several [Formula: see text] toy models focusing on the inflation epoch of the early universe. The study is done based on the definition of the scalar field in terms of the first derivative of [Formula: see text] model. We have applied the slow-roll approximations during inflationary parameters consideration. The comparison of the numerically computed inflationary parameters with the observations is done. We have inspected that some of the [Formula: see text] models produce numerical values of [Formula: see text] that are in the same range as the suggested values from observations. But for the case of the tensor-to-scalar ratio [Formula: see text], we realized that some of the considered [Formula: see text] models suffer to produce a value which is in agreement with the observed values for different considered space parameter.

Röntgenstrukturanalyse eines Diphosphaadamantans — ein erster Vertreter einer neuen Heterocyclenklasse / X-Ray Structural Analysis of a Diphosphaadamantane — First Derivative of a Novel Class of Heterocycles

1989 ◽  
Vol 44 (12) ◽  
pp. 1599-1601 ◽  
Author(s):  
Richard Neidlein ◽  
Angelika S. Funhoff ◽  
Claus Krieger
Keyword(s):  
Structural Analysis ◽  
Condensation Product ◽  
X Ray ◽  
First Derivative ◽  
A Value ◽  
Intramolecular Condensation

X-ray analysis of the intramolecular condensation product of methylene-bis-[bis-(2-oxopropyl)-phosphane oxide] (3) shows heteroadamantane structure. One of the C—P—C-angle seems to be very unusual. A value of only 95.5° was measured.

The quadrupole moment of cyanogen: a comparative study of collision-induced absorption in gaseous C2N2, CO2, and mixtures with argon

1986 ◽  
Vol 64 (11) ◽  
pp. 1475-1481 ◽  
Author(s):  
I. R. Dagg ◽  
A. Anderson ◽  
S. Yan ◽  
W. Smith ◽  
C. G. Joslin ◽  
...  
Keyword(s):  
Quadrupole Moment ◽  
Spectral Region ◽  
Gaseous Mixture ◽  
Far Infrared ◽  
Spectral Moments ◽  
A Value ◽  
Large Anisotropy ◽  
Experimental Values ◽  
Microwave Techniques ◽  
Good Agreement

The collision-induced spectra of C2N2 gas and a gaseous mixture of C2N2 and Ar at 298 K have been obtained in the spectral region below 120 cm−1 using far-infrared laser and microwave techniques as well as a Fourier-transform spectrometer. In addition, the collision-induced spectra of a gaseous mixture of CO2 and Ar are reported at temperatures of 233 and 298 K in the spectral region below 230 cm−1. The theoretical values for the spectral moments α1 and γ1 for CO2 are much smaller than the experimental values, as expected for a molecule with a relatively large quadrupole moment. However, for CO2–Ar mixtures, the agreement between the theoretically and experimentally determined spectral moments is relatively good, resulting in a value of 4.6 B for the quadrupole moment of CO2 instead of the generally accepted value of 4.3 B. The quadrupole moment of C2N2 is estimated to be 6.2 ± 0.4 B from our data and the theory for the spectral moments, if a correction is made for an overestimate of the quadrupole moment similar to that obtained for the CO2–Ar mixture. This value is considerably smaller than a previously reported calculated result of 9.0 B. Line-shape expressions based on information theory (IT6) do not yield good agreement with experiment, a result that is attributed to the large anisotropy of the molecules.

The Determination of Absolute Infrared Intensities with a Fourier Transform Spectrometer

1979 ◽  
Vol 33 (4) ◽  
pp. 346-348 ◽  
Author(s):  
Kerin Scanlon ◽  
Leo Laux ◽  
John Overend
Keyword(s):  
Fourier Transform ◽  
Test Case ◽  
Program Of Study ◽  
A Value ◽  
Integrated Intensity ◽  
Infrared Intensities ◽  
Vibration Rotation ◽  
Integrated Intensities ◽  
Systematic Program

In principle it is apparent that Fourier transform infrared spectroscopy offers a number of significant advantages in the determination of infrared intensities integrated over the rotational fine structure in vibration-rotation bands. One expects that there should be no problem with photometric accuracy; yet, before embarking on a systematic program of study, we believe it important to establish that the method will work in practice. As a test case we have chosen the V2 fundamental of CO2 at 673 cm−1 since this is, in our experience, as difficult a band as any when it comes to measuring integrated intensities. We have, using a Digilab FTS-20 spectrometer, determined a value of the integrated intensity, Γ2 = 7901 ± 105 cm2/mol which should be compared with the value previously determined on a dispersive instrument, Γ2 = 7882 ± 110 cm2/mol. We have also determined a value of Γ3 = 25,300 ± 570 cm2/mol for the integrated intensity of the antisymmetric stretching fundamental.

The quadrupole moment of acetylene from collision-induced absorption in a gaseous mixture with argon

1988 ◽  
Vol 66 (5) ◽  
pp. 453-459 ◽  
Author(s):  
I. R. Dagg ◽  
A. Anderson ◽  
W. Smith ◽  
M. Missio ◽  
C. G. Joslin ◽  
...  
Keyword(s):  
Quadrupole Moment ◽  
Line Shape ◽  
Theoretical Estimate ◽  
Gaseous Mixture ◽  
Experimental Spectrum ◽  
Laser Source ◽  
Shape Theory ◽  
Frequency Range ◽  
A Value ◽  
Theoretical Line

The collision-induced spectrum of a mixture of argon and acetylene (100:1) is reported in the frequency range below 240 cm−1. The spectrum is obtained from the total absorption in the mixture at pressures up to 1400 psi (1 psi = 6.89 kPa) and subtraction of the contribution from an allowed difference band of pure acetylene centred near 113 cm−1. The measurements are made with a Michelson Fourier-transform interferometer and with a laser source at 84.1 cm−1. The quadrupole moment of acetylene determined from the experimental spectrum and existing theory for the integrated absorption coefficient is 5.42 (± 0.41) B if a theoretical estimate of the hexadecapole moment is used. Alternatively, a value of 6.14 (± 0.46) B is obtained if the contribution from the hexadecapole moment is assumed to be zero. An extension of the line-shape theory, 1T6, that includes the contribution from hexadecapolar induction is also reported. The resulting theoretical line shape is compared with the experimental spectrum.

scholarly journals Coulomb Excitation of the 2·615 MeV (3?) and 4.086 MeV (2+) States of 208Pb

1984 ◽  
Vol 37 (2) ◽  
pp. 123 ◽  
Author(s):  
WJ Vermeer ◽  
MT Esat ◽  
JA Kuehner ◽  
RH Spear ◽  
AM Baxter ◽  
...  
Keyword(s):  
Quadrupole Moment ◽  
Electron Scattering ◽  
Coulomb Excitation ◽  
Theoretical Calculations ◽  
A Value ◽  
O 15 ◽  
Static Quadrupole

Coulomb excitation studies of the 2�615 MeV (3-) and 4�086 MeV (2+) states of 208Pb have been carried out using 12C and 160 projectiles at various energies and scattering angles. Results for the 3- state are: B(E3;O+~3-) = O'611�O'012e2b 3 ; and the static quadrupole moment Q3 - = - O�34� O�15 e b, which is larger in magnitude than most theoretical calculations. Results for the 2+ state imply that Q2+ = -0�7�0�3 eb if a value for B(E2;0+~2+) determined from electron scattering work is assumed.

Sign in / Sign up

Export Citation Format

Share Document