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.

scholarly journals Infrared Intensities in Methyl Chloride. II. Binary Overtone and Combination Bands

1984 ◽  
Vol 57 (1) ◽  
pp. 16-21 ◽  
Author(s):  
Shigeo Kondo ◽  
Yoshinori Koga ◽  
Taisuke Nakanaga ◽  
Shinnosuke Saëki
Keyword(s):  
Methyl Chloride ◽  
Infrared Intensities ◽  
Combination Bands

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.

Analysis of the high resolution spectrum of the ν2 and ν5 absorption bands of methyl chloride

1984 ◽  
Vol 62 (3) ◽  
pp. 247-253 ◽  
Author(s):  
M. Morillon-Chapey ◽  
G. Guelachvili ◽  
Per Jensen
Keyword(s):  
Standard Deviation ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Least Squares ◽  
Methyl Chloride ◽  
High Resolution Spectrum ◽  
Vibrational States ◽  
Absorption Bands ◽  
Least Squares Fit

The infrared spectrum of methyl chloride CH3Cl between 1280 and 1650 cm−1 has been recorded at high resolution (0.005 cm−1). The Coriolis interactions between ν2(A1) and ν5(E) and between 2ν3(A1) and ν5 have been investigated through a least squares fit to the transitions observed for CH335Cl. Ten parameters for the three upper vibrational states and three interaction constants have been determined, reproducing the 1200 observed wavenumbers with a standard deviation of 0.002 cm−1. An accidental resonance of the type l(ΔK = 2, Δl = −1) between ν2 and ν5 was found to be present in the spectrum.

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.

The high-resolution infrared spectrum of BrCl

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1145-1154 ◽  
Author(s):  
Hiromichi Uehara ◽  
Toichi Konno ◽  
Yasushi Ozaki ◽  
Koui Horiai ◽  
Kuniaki Nakagawa ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Standard Deviation ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Potential Function ◽  
Internuclear Distance ◽  
Spectral Lines ◽  
Fourier Transform Spectrometer ◽  
Isotopic Species ◽  
Correction Terms

The high-resolution infrared spectrum of BrCl has been observed with a Fourier transform spectrometer. About 850 spectral lines for the Δν = 1 sequences of the four isotopic species, 79Br35Cl, 81Br35Cl, 79Br37Cl, and 81Br37Cl have been measured between 417 and 461 cm−1. They have been fitted with a standard deviation of 0.000 146 cm−1 to a Dunham potential function using eight coefficients that included two Watson-type Δ correction terms. Dunham Yij coefficients have been derived for each of the four isotopic species. The equilibrium internuclear distance re of BrCl is 2.136 053 28 (67) Å.

Étude par transformée de Fourier, du spectre, du silane dans la région de 1000 cm−1. Analyse de la diade ν2 et ν4

1986 ◽  
Vol 64 (3) ◽  
pp. 341-350 ◽  
Author(s):  
G. Pierre ◽  
A. Valentin ◽  
L. Henry
Keyword(s):  
Absorption Spectrum ◽  
Fourier Transform ◽  
Standard Deviation ◽  
Line Width ◽  
Natural Abundance ◽  
Effective Hamiltonian ◽  
Absolute Accuracy ◽  
Isotopic Species ◽  
Wave Numbers ◽  
Hamiltonian Parameters

A Fourier-transform absorption spectrum of the three silicium isotopes of silane in natural abundance have been recorded from 840 to 1040 cm−1. The line width is 3 × 10−3 cm−1 and the absolute accuracy is estimated to be about 2 × 10−4 cm−1 for non-saturated and non-overlapped lines. The analysis of this spectrum is achieved, using a Hamiltonian, formulated with an irreducible tensorial set in the Td group.For the dyad ν2 and ν4 and for each isotopic species, 30 reduced effective Hamiltonian parameters are determined, giving the line wave numbers with 2.5 × 10−4 cm−1 for 28SiH4, 3.4 × 10−4 cm−1 for 29SiH4, and 5.5 × 10−4 cm−1 for 30SiH4 as the standard deviation for J = 0–20.

Vibration-rotation bands and molecular constants of methyl iodide

1965 ◽  
Vol 288 (1412) ◽  
pp. 50-59 ◽  
Keyword(s):  
Methyl Iodide ◽  
Coupling Constants ◽  
Rotational Line ◽  
Coriolis Coupling ◽  
Molecular Constants ◽  
Isotopic Species ◽  
Vibration Rotation ◽  
Product Rules ◽  
Degenerate Modes ◽  
Combination Bands

The rotational line structure of seven parallel and seven perpendicular vibration bands of methyl iodide has been measured with high resolution, and the molecular rotational constants have been determined. Values of a x and a x and the Coriolis coupling constants for the fundamental degenerate modes have been determined. The values for overtone and combination bands usually agree closely with those predicted from the values found for the fundamentals. There appear to be inexplicable perturbations in some of the perpendicular bands. The ratio of A values, an d frequency product rules, for the isotopic species CH 3 I and CD 3 I are in accordance with theory.

Nucleic Acid Molecules Prepared by Monolayer Techniques

1972 ◽  
Vol 30 ◽  
pp. 178-179
Author(s):  
Dimitrij Lang
Keyword(s):  
Electron Microscopy ◽  
Standard Deviation ◽  
Nucleic Acid ◽  
Cytochrome C ◽  
Nucleic Acids ◽  
Contour Length ◽  
Sample Standard Deviation ◽  
Molecular Weights ◽  
Length Measurements ◽  
Protein Monolayer

The success of the protein monolayer technique for electron microscopy of individual DNA molecules is based on the prevention of aggregation and orientation of the molecules during drying on specimen grids. DNA adsorbs first to a surface-denatured, insoluble cytochrome c monolayer which is then transferred to grids, without major distortion, by touching. Fig. 1 shows three basic procedures which, modified or not, permit the study of various important properties of nucleic acids, either in concert with other methods or exclusively:1) Molecular weights relative to DNA standards as well as number distributions of molecular weights can be obtained from contour length measurements with a sample standard deviation between 1 and 4%.

Reliability of the Minimum Masking Level as Outcome Variable in Tinnitus Clinical Research

2020 ◽  
Vol 29 (3) ◽  
pp. 429-435
Author(s):  
Patricia C. Mancini ◽  
Richard S. Tyler ◽  
Hyung Jin Jun ◽  
Tang-Chuan Wang ◽  
Helena Ji ◽  
...  
Keyword(s):  
Standard Deviation ◽  
High Frequency ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Outcome Variable ◽  
Reliable Estimate ◽  
Moderate Correlation ◽  
Trained Subjects ◽  
The Relationship ◽  
Minimum Intensity

Purpose The minimum masking level (MML) is the minimum intensity of a stimulus required to just totally mask the tinnitus. Treatments aimed at reducing the tinnitus itself should attempt to measure the magnitude of the tinnitus. The objective of this study was to evaluate the reliability of the MML. Method Sample consisted of 59 tinnitus patients who reported stable tinnitus. We obtained MML measures on two visits, separated by about 2–3 weeks. We used two noise types: speech-shaped noise and high-frequency emphasis noise. We also investigated the relationship between the MML and tinnitus loudness estimates and the Tinnitus Handicap Questionnaire (THQ). Results There were differences across the different noise types. The within-session standard deviation averaged across subjects varied between 1.3 and 1.8 dB. Across the two sessions, the Pearson correlation coefficients, range was r = .84. There was a weak relationship between the dB SL MML and loudness, and between the MML and the THQ. A moderate correlation ( r = .44) was found between the THQ and loudness estimates. Conclusions We conclude that the dB SL MML can be a reliable estimate of tinnitus magnitude, with expected standard deviations in trained subjects of about 1.5 dB. It appears that the dB SL MML and loudness estimates are not closely related.

Bedingungen für den Erfolg übergewichtiger und adipöser Kinder in einem ambulanten Programm zur Gewichtsreduktion durch Veränderungen des Lebensstils

2010 ◽  
Vol 38 (5) ◽  
pp. 351-360 ◽  
Author(s):  
Wilfried Pott ◽  
Georg Fröhlich ◽  
Özgür Albayrak ◽  
Johannes Hebebrand ◽  
Ursula Pauli-Pott
Keyword(s):  
Body Mass Index ◽  
Standard Deviation ◽  
Body Mass ◽  
Standard Deviation Score ◽  
Psychische Belastung ◽  
Deviation Score ◽  
Höheres Alter

Fragestellung: Es wurde der Frage nachgegangen, ob sich erfolgreiche Teilnehmer eines ambulanten familienzentrierten Gewichtskontrollprogramms durch spezifische familiäre und psychologische Charakteristiken auszeichnen. Einbezogen wurden die psychosoziale Risikobelastung der Familie, Depressivität und Bindungsstil der Hauptbezugsperson, der Body mass index (BMI) und der BMI-Standardabweichungswert («Standard deviation score», SDS) des teilnehmenden Kindes und der Familienmitglieder sowie die individuelle psychische Belastung des teilnehmenden Kindes. Methodik: Die Daten wurden per Interview und Fragebogen vor dem Behandlungsbeginn erhoben. Von 136 in das Programm aufgenommenen übergewichtigen und adipösen Kindern zwischen 7 und 15 Jahren beendeten 116 das 12-monatige Interventionsprogramm. Von diesen zeigten 100 (85,3 %) eine Reduktion des BMI-SDS und 79 (68.1 %) eine mehr als 5 %ige Reduktion des BMI-SDS. Diese «erfolgreichen» Kinder wurden mit 56 «nicht erfolgreichen» (Abbrecher und Kinder mit einer 5 %igen oder geringeren Reduktion des BMI-SDS) verglichen. Ergebnisse: Nicht erfolgreiche Kinder unterschieden sich von den erfolgreichen durch ein höheres Alter, eine höhere psychosoziale Risikobelastung, Depressivität und einen vermeidenden Bindungsstil der Mutter sowie durch das Vorhandensein adipöser Geschwister. In einer logistischen Regressionsanalyse zeigten sich mütterliche Depressivität und das Vorhandensein adipöser Geschwister als beste und voneinander unabhängige Prädiktoren. Schlussfolgerungen: Um die spezifischen Bedürfnisse der Familien zu erfüllen und einen Misserfolg zu verhindern, sollten zusätzliche Programmbausteine zur spezifischen Unterstützung von Jugendlichen mit adipösen Geschwistern und Müttern mit Depressionen und vermeidenden Bindungsstil entwickelt werden. Die Wirksamkeit dieser Module muss dann in weiteren Studien überprüft werden.

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