Processes involved in the Cs(7P)+H2→CsH reaction and nascent rotational distribution

1986 ◽  
Vol 84 (3) ◽  
pp. 1482-1486 ◽  
Author(s):  
J. P. Visticot ◽  
M. Ferray ◽  
P. D’Oliveira ◽  
B. Sayer
Keyword(s):  
Rotational Distribution

Rotational Distribution of CO(b3Σ+) Produced in Energy Transfer Reaction from Ar(3P2) to CO

1992 ◽  
Vol 65 (6) ◽  
pp. 1713-1715
Author(s):  
Masaharu Tsuji ◽  
Kazuo Yamaguchi ◽  
Mitsuo Kikukawa ◽  
Hiroyuki Kouno ◽  
Tsuyoshi Funatsu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Transfer Reaction ◽  
Rotational Distribution

On the Rotational Distribution of N2 in the ArN2-Discharge. The OO-Band of the Second Positive System

1983 ◽  
Vol 23 (2) ◽  
pp. 145-151 ◽  
Author(s):  
D. Venzke ◽  
J. Mizeraczyk ◽  
H. Szczepanska ◽  
E. Korn
Keyword(s):  
Positive System ◽  
Rotational Distribution

Infra-red chemiluminescence II. Spectroscopic data

1960 ◽  
Vol 258 (1295) ◽  
pp. 564-575 ◽  
Keyword(s):  
Transition Probabilities ◽  
Molecular Spectroscopy ◽  
Radiative Transition ◽  
Absorption Data ◽  
A Value ◽  
Interaction Factor ◽  
Infra Red ◽  
Rotational Distribution ◽  
Vibration Rotation ◽  
First Time

The technique described in part I has been used to obtain constants of interest in molecular spectroscopy. The vibration-rotation interaction factor, F for HCl has been evaluated from the infra-red emission spectrum. The critical parameter in F is θ = M 0 / M 1 r e , where M 0 and M 1 are the first two coefficients in the electric dipole moment expansion about the equilibrium internuclear distance r e . A value of θ = + 1.12 ± 0.18 has been obtained. It is shown that for molecules with θ = +1 the total band intensity in emission is independent of the rotational distribution in the vibrational state from which the emission occurs. This has been made use of in evaluating radiative transition probabilities. For the HCl v (3-1) transition a value for | R 3 1 | 2 (= 1.60 x 10 -4 debye 2 ) was obtained for the first time. The same method yields a value of | R 2 1 | 2 / | R 2 0 | 2 = 204, in good agreement with an earlier estimate from absorption data.

scholarly journals Study of the Vibrational Predissociation of the NeBr2 Complex by Computational Simulation Using the Trajectory Surface Hopping Method

Mathematics ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 2029
Author(s):  
Ernesto García-Alfonso ◽  
Maykel Márquez-Mijares ◽  
Jesús Rubayo-Soneira ◽  
Nadine Halberstadt ◽  
Kenneth C. Janda ◽  
...  
Keyword(s):  
Energy Surface ◽  
Computational Simulation ◽  
Kinetic Mechanism ◽  
Experimental Methods ◽  
Classical Dynamics ◽  
Vibrational States ◽  
Surface Hopping ◽  
Vibrational Predissociation ◽  
New Information ◽  
Rotational Distribution

The vibrational predissociation of NeBr2 has been studied using a variety of theoretical and experimental methods, producing a large number of results. It is therefore a useful system for comparing different theoretical methods. Here, we apply the trajectory surface hopping (TSH) method that consists of propagating the dynamics of the system on a potential energy surface (PES) corresponding to quantum molecular vibrational states with possibility of hopping towards other surfaces until the van der Waals bond dissociates. This allows quantum vibrational effects to be added to a classical dynamics approach. We have also incorporated the kinetic mechanism for a better compression of the evolution of the complex. The novelty of this work is that it allows us to incorporate all the surfaces for (v=16,17,…,29) into the dynamics of the system. The calculated lifetimes are similar to those previously reported experimentally and theoretically. The rotational distribution, the rotational energy and jmax are in agreement with other works, providing new information for this complex.

scholarly journals Evidence of a significant rotational non-LTE effect in the CO<sub>2</sub> 4.3 µm PFS-MEX limb spectra

2017 ◽  
Vol 10 (1) ◽  
pp. 265-271 ◽  
Author(s):  
Alexander A. Kutepov ◽  
Ladislav Rezac ◽  
Artem G. Feofilov
Keyword(s):  
Near Infrared ◽  
Thermal Structure ◽  
Radiative Lifetime ◽  
Martian Atmosphere ◽  
Vibrational States ◽  
Rotational States ◽  
First Results ◽  
Rotational Distribution ◽  
Multi Level ◽  
Excited Molecules

Abstract. Since January 2004, the planetary Fourier spectrometer (PFS) on board the Mars Express satellite has been recording near-infrared limb spectra of high quality up to the tangent altitudes ≈ 150 km, with potential information on density and thermal structure of the upper Martian atmosphere. We present first results of our modeling of the PFS short wavelength channel (SWC) daytime limb spectra for the altitude region above 90 km. We applied a ro-vibrational non-LTE model based on the stellar astrophysics technique of accelerated lambda iteration (ALI) to solve the multi-species and multi-level CO2 problem in the Martian atmosphere. We show that the long-standing discrepancy between observed and calculated spectra in the cores and wings of 4.3 µm region is explained by the non-thermal rotational distribution of molecules in the upper vibrational states 10011 and 10012 of the CO2 main isotope second hot (SH) bands above 90 km altitude. The redistribution of SH band intensities from band branch cores into their wings is caused (a) by intensive production of the CO2 molecules in rotational states with j > 30 due to the absorption of solar radiation in optically thin wings of 2.7 µm bands and (b) by a short radiative lifetime of excited molecules, which is insufficient at altitudes above 90 km for collisions to maintain rotation of excited molecules thermalized. Implications for developing operational algorithms for massive processing of PFS and other instrument limb observations are discussed.

Rotational distribution of N2 in Ar shock wave

1980 ◽  
Vol 73 (7) ◽  
pp. 3218-3222 ◽  
Author(s):  
Katsuhisa Koura
Keyword(s):  
Shock Wave ◽  
Rotational Distribution

scholarly journals On the origin of the bimodal rotational velocity distribution in stellar clusters: rotation on the pre-main sequence

2020 ◽  
Vol 495 (2) ◽  
pp. 1978-1983
Author(s):  
Nate Bastian ◽  
Sebastian Kamann ◽  
Louis Amard ◽  
Corinne Charbonnel ◽  
Lionel Haemmerlé ◽  
...  
Keyword(s):  
Main Sequence ◽  
Rotational Velocity ◽  
Open Clusters ◽  
Observational Constraints ◽  
Stellar Clusters ◽  
Period Distribution ◽  
Low Mass ◽  
Rotational Distribution ◽  
Set Up ◽  
Pms Stars

ABSTRACT We address the origin of the observed bimodal rotational distribution of stars in massive young and intermediate age stellar clusters. This bimodality is seen as split main sequences at young ages and also has been recently directly observed in the Vsini distribution of stars within massive young and intermediate age clusters. Previous models have invoked binary interactions as the origin of this bimodality, although these models are unable to reproduce all of the observational constraints on the problem. Here, we suggest that such a bimodal rotational distribution is set-up early within a cluster’s life, i.e. within the first few Myr. Observations show that the period distribution of low-mass ($\lesssim\! 2 \, \mathrm{M}_\odot$) pre-main-sequence (PMS) stars is bimodal in many young open clusters, and we present a series of models to show that if such a bimodality exists for stars on the PMS that it is expected to manifest as a bimodal rotational velocity (at fixed mass/luminosity) on the main sequence for stars with masses in excess of ∼1.5 M⊙. Such a bimodal period distribution of PMS stars may be caused by whether stars have lost (rapid rotators) or been able to retain (slow rotators) their circumstellar discs throughout their PMS lifetimes. We conclude with a series of predictions for observables based on our model.

Photodissociation Dynamics of Vinyl Chloride Investigated with a Pulsed Slit-Jet and Time-Resolved Fourier-Transform Spectroscopy

2004 ◽  
Vol 57 (12) ◽  
pp. 1161 ◽  
Author(s):  
Mohammed Bahou ◽  
Yuan-Pern Lee
Keyword(s):  
Fourier Transform ◽  
Vinyl Chloride ◽  
Flow System ◽  
Supersonic Jet ◽  
Infrared Emission ◽  
Time Resolved ◽  
Type Distribution ◽  
Trajectory Calculations ◽  
Rotational Distribution ◽  
193 Nm

Following photodissociation of vinyl chloride seeded in a He supersonic jet at 193 nm, rotationally resolved infrared emission of HCl (v) are recorded to yield nascent rotational and vibrational distributions. Preliminary results show that the rotational distribution of HCl free from rotational quenching deviates slightly from Boltzmann-type distribution and agrees well with trajectory calculations; a portion of the low-J component observed previously in a flow system is attributed to quenching. The implications for photodissociation dynamics are discussed.

QUASICLASSICAL TRAJECTORY CALCULATION OF THE CHEMICAL REACTION Ba + HI

2009 ◽  
Vol 08 (05) ◽  
pp. 827-835 ◽  
Author(s):  
LI YAO ◽  
YONGLU LIU ◽  
HAIYANG ZHONG ◽  
WANGHE CAO
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Cross Section ◽  
Reaction Cross Section ◽  
Energy Surface ◽  
Reaction Cross ◽  
Trajectory Calculation ◽  
Quasiclassical Trajectory Calculation ◽  
Rotational Distribution ◽  
Good Agreement

This paper reports the results of quasiclassical trajectory calculation on extended London-Eyring-Polanyi-Sato potential energy surface for the reaction between Ba atom and HI . The rotational distribution, vibrational distribution, reaction cross section, and rotational alignment are all obtained and they are under detailed discussion for product BaI . The calculated results are in good agreement with the experimental results.

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