Study of the ν1 + ν3 and ν1 + ν6 infrared bands of methyl chloride

1981 ◽  
Vol 59 (8) ◽  
pp. 994-1008 ◽  
Author(s):  
Najate Bensari-Zizi ◽  
Claude Alamichel ◽  
Guy Guelachvili
Keyword(s):  
Least Squares ◽  
Methyl Chloride ◽  
Rotational Structure ◽  
Fermi Resonance ◽  
Molecular Constants ◽  
Isotopic Species ◽  
Expected Values ◽  
Standard Deviations

The ν1 + ν3 and ν1 + ν6 bands have been recorded with a resolution of 0.0075 cm−1 and about 2000 lines have been assigned. Classical least squares calculations (without resonance) have given standard deviations between 0.005 and 0.008 cm−1 for both bands and both isotopic species. As the molecular constants thus obtained are quite close to the expected values, the perturbations caused by a possible Fermi resonance are not really noticeable on the rotational structure.

Étude des bandes infrarouges en résonance 2ν2, ν2 + ν5, , , 2ν3 + ν5 et 4ν3 du chlorure de méthyle

1982 ◽  
Vol 60 (6) ◽  
pp. 825-843 ◽  
Author(s):  
Najath Binsari-Zizi ◽  
Claude Alamichel ◽  
Guy Guelachvili
Keyword(s):  
Fourier Transform ◽  
Standard Deviation ◽  
High Resolution ◽  
Least Squares ◽  
Methyl Chloride ◽  
Coupling Model ◽  
Fermi Resonance ◽  
Simplified Model ◽  
Interaction Scheme ◽  
Very High

The spectrum of methyl chloride has been analyzed between 2650 and 2950 cm−1 from Fourier transform recordings obtained with a very high resolution. More than 3000 lines of CH335Cl and more than 1500 lines of CH337Cl, most of them belonging to ν2 + ν5 and [Formula: see text], have been assigned: the 2ν2, [Formula: see text], 4ν3 and 2ν3 + ν5 bands are very weak and only appear when there are level crossings. The main interaction is the Coriolis resonance between the ν2 and ν5 modes, which links the rovibrational levels six by six. The Fermi resonance between [Formula: see text] and ν1, whose existence has just been shown, does not seem to have important consequences. Numerous other resonances, particularly making the 4ν3 and 2ν3 + ν5 bands visible, must be added to the basic coupling model; they make the general interaction scheme extremely complex. A least squares calculation, according to a simplified model, has given a standard deviation of 0.029 cm−1 over 784 lines of CH337Cl, from which crossings and locally perturbed subbands were excluded.

Effect of isotope shifts in the blue–green band spectrum of the lead dimer

1984 ◽  
Vol 62 (12) ◽  
pp. 1232-1236
Author(s):  
L.-E. Berg ◽  
S. Ismail ◽  
L. Klynning ◽  
H. Martin ◽  
A. Pereira ◽  
...  
Keyword(s):  
Rotational Structure ◽  
Band Spectrum ◽  
Interference Effects ◽  
Green Band ◽  
Structure Form ◽  
Molecular Constants ◽  
Dense Structure ◽  
Isotopic Species ◽  
The Individual ◽  
Limited Spectrum

The absorption spectrum of gaseous Pb2 has been investigated in the blue – green spectral region. Owing to the overlap between the six dominating isotopic Pb2 molecules formed by natural lead – in combination with the very dense structure of the [Formula: see text] transition – it is impossible to rotationally resolve the Doppler limited spectrum. Still, regions of rotational structure were resolved. These were explained by interference effects between the absorption spectra of the individual isotopic species. The regions of resolved rotational structure form a pattern similar to a moiré pattern. The information gained is used together with laser induced fluorescence data in a reanalysis of the F and X states. The following main molecular constants for the 208Pb2 molecule have been derived (cm−1):[Formula: see text]

The A–X system of the CuCl molecule

1981 ◽  
Vol 59 (2) ◽  
pp. 289-297 ◽  
Author(s):  
G. P. Mishra ◽  
S. B. Rai ◽  
K. N. Upadhya
Keyword(s):  
High Resolution ◽  
Ground State ◽  
Electronic Transition ◽  
Band System ◽  
Rotational Structure ◽  
Molecular Constants ◽  
X Band ◽  
Standard Deviations ◽  
Concave Grating ◽  
Π State

The A–X band system of CuCl has been photographed in emission under high resolution in the 2nd order of a 10.6 m concave grating spectrograph. Rotational structure in four bands, viz. (1,0), (0,0), (0,1), and (1,2) has been analysed. The present analysis confirms that in the A–X system the electronic transition involved is 1Π–1Σ where 1Σ is the ground state of the molecule. The Λ-type doubling in the 1Π state is found to be appreciable. The molecular constants for the excited A state of 63Cu35Cl are (with standard deviations in parentheses): Be = 0.168432(7) cm−1; αe = 0.001067(7); De = 0.1134(11) × 10−6; q = 0.000871(9); qD = 0.85(18) × 10−8; ν10 = 19 500.271(8); ν00 = 18 999.104(7); ν01 = 18 579.735(10); and ν12 = 18 574.745(11).

scholarly journals GEOMETRIC ASPECTS EVALUATION OF GNSS CONTROL NETWORK FOR DEFORMATION MONITORING IN THE JATIGEDE DAM REGION

2019 ◽  
Vol 15 (2) ◽  
pp. 167
Author(s):  
Made Ditha Ary Sanjaya ◽  
T. Aris Sunantyo ◽  
Nurrohmat Widjajanti
Keyword(s):  
Least Squares ◽  
Deformation Monitoring ◽  
Network Configuration ◽  
Control Networks ◽  
Quality Of Control ◽  
Least Squares Adjustment ◽  
Standard Deviations ◽  
Dam Deformation ◽  
Gnss Networks

Many factors led to dam construction failure so that deformation monitoring activities is needed in the area of the dam. Deformation monitoring is performed in order to detect a displacement at the control points of the dam. Jatigede Dam deformation monitoring system has been installed and started to operate, but there has been no evaluation of the geometry quality of control networks treated with IGS points for GNSS networks processing. Therefore, this study aims to evaluate the geometric quality of GNSS control networks on deformation monitoring of Jatigede Dam area. This research data includes the GNSS measurements of five CORS Jatigede Dam stations (R01, GG01, GCP04, GCP06, and GCP08) at doy 233 with network configuration scenarios of 12 IGS points on two quadrants (jat1), three quadrants (jat2), and four quadrants (jat3 and jat4). GNSS networks processing was done by GAMIT to obtain baseline vectors, followed by network processing usingparameter method of least squares adjustment. Networks processing with least squares adjustment aims to determine the most optimal  by precision and reliability criterion. Results of this study indicate that network configuration with 12 IGS stations in the two quadrants provides the most accurate coordinates of CORS dam stations. Standard deviations value of CORS station given by jat1 configuration are in the range of 2.7 up to 4.1 cm in X-Z components, whereas standard deviations in the Y component are in the range 5.8 up to 6.9 cm. An optimization assessment based on network strength, precision, and reliability factors shows optimum configuration by jat1.

Schwingungsberechnungen der isotopen VOCl3-Moleküle, des VOBr3 und der Verbindungen VOCln Br3-n , sowie einige Molekularkonstanten der Titelverbindungen

1974 ◽  
Vol 29 (5) ◽  
pp. 706-711 ◽  
Author(s):  
H. Hovdan ◽  
S. J. Cyvin ◽  
W. Brockner
Keyword(s):  
Potential Energy ◽  
Coupling Constants ◽  
Potential Energy Distribution ◽  
Thermodynamic Quantities ◽  
Coriolis Coupling ◽  
Molecular Constants ◽  
Isotopic Species ◽  
The Mean ◽  
Calculated Potential Energy ◽  
Formula Type

Abstract In order to determine the isotopic splittings of the vibrational frequencies of isotopieally substituted vanadium oxytrichloride and to present the correlation between VOCl3 and VOBr3 a set of force fields was constructed for the isotopic species of VOCl3 , VOCl2Br, VOCIBr2, and VOBr3 . The conventional descriptions of the fundamentals are supported by the calculated potential energy distribution in all cases. Furthermore the calculations of certain molecular constants such as the mean amplitudes, their corresponding K-values, the Coriolis coupling constants of the -type and some thermodynamic quantities have been performed.

On the b1Σ–X3Σ transitions of SeO and AsF

1978 ◽  
Vol 56 (10) ◽  
pp. 1399-1401 ◽  
Author(s):  
P. Kristiansen
Keyword(s):  
Least Squares ◽  
Linear Models ◽  
Linear Least Squares ◽  
Molecular Constants ◽  
Non Linear

A non-linear least-squares procedure has been used to determine molecular constants for SeO and AsF from the b1Σ–X3Σ transitions. The present investigation strongly indicates that the original J-numbering based on combination differences and linear models is incorrect for some of the branches.

High-resolution laser-excitation spectrum of the A2Π ← X2Σ system of TiN: rotational analysis of the 0–0, 1–1, and 2–2 bands

1985 ◽  
Vol 63 (7) ◽  
pp. 997-1004 ◽  
Author(s):  
K. Brabaharan ◽  
J. A. Coxon ◽  
A. Brian Yamashita
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Excitation Spectrum ◽  
Laser Excitation ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Individual Bands ◽  
Measured Line ◽  
Line Positions ◽  
Π State

The 0–0, 1–1, and 2–2 bands of the A2Π ← X2Σ system of TiN have been recorded using the technique of laser-excitation spectroscopy. Molecular constants have been obtained from direct least squares fits of the measured line positions of individual bands. The fitted constants confirm and extend previous determinations; for the A2Π state, some of the constants show unusually large variations with ν, in accord with the already known perturbation of this state in the ν = 0 level.

Study of the and ν2 + 2ν3 infrared bands of methyl chloride

1982 ◽  
Vol 60 (11) ◽  
pp. 1661-1671 ◽  
Author(s):  
Najate Bensari-Zizi ◽  
Claude Alamichel
Keyword(s):  
Standard Deviation ◽  
Methyl Chloride ◽  
Isotopic Species ◽  
Combination Bands

The [Formula: see text] and ν2 + 2ν3 combination bands have been identified, their band centres lying around 2751 and 2796 cm−1 respectively. Their lines are mixed with those of the strong ν2 + ν5 band. For the [Formula: see text] unperturbed band, in the case of the CH335Cl isotopic species, a standard deviation of 0.007 cm−1 has been obtained over 355 lines. For the ν2 + 2ν3 band, coupled to 2ν3 + ν5 by a Coriolis resonance, a standard deviation of 0.008 cm−1 has been obtained over 237 lines of the CH335Cl isotopic species.

High-Resolution Infrared Spectrum of Diazirine, H2CN2. Rovibrational Analysis of the Methylene Deformation Band

1988 ◽  
Vol 43 (4) ◽  
pp. 331-337 ◽  
Author(s):  
A. Gambi ◽  
A. Baldacci ◽  
S. Giorgianni
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Least Squares ◽  
Deformation Band ◽  
Fourier Transform Spectrometer ◽  
Centrifugal Distortion ◽  
Molecular Constants ◽  
Centrifugal Distortion Constants

Abstract The infrared spectrum of diazirine has been recorded at Doppler resolution with a high informa­tion Fourier transform spectrometer. The ν3 fundamental has been reinvestigated and the overall assignment of the rovibrational transitions has been carried out. From the least-squares analysis a more accurate set of molecular constants including the sextic centrifugal distortion constants has been determined for the level υ3 = 1 and will be reported here. The higher resolution achieved here allowed the assignment of weaker lines and many Q branch transitions. Moreover many blended lines have now been resolved and could be properly assigned.

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