Étude des mouvements moléculaires en milieu liquide au moyen de la largeur des bandes de vibration dans l’infrarouge

Soussen-Jacob, J.; Vincent‐Geisse, J.; Beaulieu, Danielle; Tsakiris, J.

doi:10.1051/jcp/1970671118

Cited by 6 publications

(3 citation statements)

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“…Ce rapport entre les largeurs ressort tgalement des calculs de Favro (13) dernikre presente, cause de la rtsonance de Fermi, une certaine proportion de transition 2v2, les anomalies observtes peuvent s'expliquer par cet effet et il est plus sQr de prendre en considtration la largeur de v, (ou 2A,). Nous avons rtuni dans le tableau 3 les constantes de diffusion rotationnelle calcultes pour v, (a partir de 26,) au moyen de la relation [4], lorsque cette diffusion semble le processus prtpondtrant dans l'tlargissement. Sur ce tableau, le pentane et l'hexane viennent en t&te pour la valeur de D ; c'est dans ces solvants que la diffusion rotationnelle apparait la plus rapide; le sulfure de carbone et le tttrachlorure de carbone, quoique reputts inertes, se situent loin derrikre et montrent d'ailleurs de nombreuses anomalies.…”

Section: Largeur Des Bandes Resultats Et Discussionunclassified

“…Le profil des bandes est dCterminC par les fluctuations de frCquence dues aux variations aliatoires du potentiel inter-molCculaire et par les mouvements de rotation des molCcules (1,2). Dans le cas gCnCral, le probltme est trts complexe; nous en avons examink quelques exemples dans des articles prC-cCdents (3,4). Si l'on veut comDarer les rCsultats lieu a une interpretation thCorique satisfaisante.…”

Section: Introductionunclassified

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Etude des mouvements de molécules linéaires en phase liquide par analyse du profil des bandes d'absorption infrarouge. I. Oxyde nitreux

Vincent‐Geisse¹,

Soussen-Jacob²,

Tai³

et al. 1970

Can. J. Chem.

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Groupe de Recherches no 3 du C.N.R.S., DPpartemerzt de Recherches Physiques, FacultP des Sciences, 9, quai Saint Bernard, Paris ( S o ) , Frarzce Requ le 13 juillet 1970On a effectuC la mesure de la largeur et du profil des 3 bandes de vibration fondamentales et de quelques harmoniques de la molecule NZO en solution dans un grand nombre de solvants. Dans le cas de quelques solvants non polaires les largeurs des bandes observees semblent determinees par des mouvements de rotation de la molicule dissoute; dans les autres cas on ne peut negliger les variations du potentiel intermoleculaire. On a d'autre part calculC les fonctions de correlation et les moments correspondants; les chiffres obtenus sont interprCtCs dans I'hypothese ou la largeur est due aux mouvements de rotation et de diffusion rotationnelle de la molCcule; ils se montrent sensiblement en accord avec la thCorie dans le cas des solvants non polaires. Nous donnons de plus une valeur approchee du couple de rappel agissant sur la moltcule NZO en milieu liquide.Measurements have been made of the width and profile of the three fundamental vibration bands and of some harmonics of the NZO molecule in solution in a large number of solvents. I n the case of some non polar solvents the widths of the bands observed appear to be determined by rotational motions of the solute molecules; in other cases variations in the intermolecular potential cannot be neglected. The correlation functions and corresponding moments were then calculated; the values obtained are interpreted using the hypothesis that the width arises as a result of rotation and rotational diffusion movements of the molecule; they appear approximately in agreement with theory in the case of non polar solvents. In addition, we give an approximate value of the torque acting on the NZO molecule in liquid medium.

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Section: Largeur Des Bandes Resultats Et Discussionunclassified

Section: Introductionunclassified

Etude des mouvements de molécules linéaires en phase liquide par analyse du profil des bandes d'absorption infrarouge. I. Oxyde nitreux

Vincent‐Geisse¹,

Soussen-Jacob²,

Tai³

et al. 1970

Can. J. Chem.

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“…Liquid S02, SOCI2 (1 13), N20 (114), and nitromethane (115) have been investigated by means of bandshape analysis. Bratoz, Rios & Guissani (1 11) have developed a semiclassical stochastic theory of infrared absorption by diatomic molecules in inert solvents.…”

Section: Liquid Phase Studies3mentioning

confidence: 99%

Infrared Spectroscopy

Ewing¹

1972

Annu. Rev. Phys. Chem.

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The past several reviews (1-3) presented in the Annual Review of Physical Chemistry entitled "Vibrational Spectroscopy" have included discussion of both Raman and infrared techniques. The present review is then somewhat unique since only infrared spectroscopy is to be considered. The recent de velopment of tunable infrared sources and the new techniques of nonlinear absorption that provide extraordinarily high resolution spectra justify re stricting the topic of this review to infrared spectroscopy alone since important new directions in this field are being mapped. Furthermore a new emphasis on determining intermolecular forces of molecules by infrared spectroscopy seems to be forming.The topics selected in this review reflect the author's own subjective view of what is interesting and exciting in the field. It is hoped that the reader will find what is presented here a fair presentation of at least some of the new trends in infrared spectroscopy. INSTRUMENTATION 2Hadamard transform spectroscopy.-There is considerable interest in developing cheap and efficient infrared spectrometers for the quantitative detection of specific components of industrial and atmospheric samples. The recently developed Hadamard Transform Spectrometer (HTS) (4, 5) offers several advantages over conventional dispersive spectrometers, filter spectrom eters (6), and Michelson interferometers. A conventional scanning instrument is very slow and has highly restricted throughput. Although the Michelson interferometer uses available signal power more efficiently, much of the data collected have no information content of analytical interest. Filter spectrophotometers and dispersive instruments equipped with multiple detectors require expensive repetitious electronics and are highly susceptible to internal drift.Consider the determination of the intensities on N spectral elements cor responding to characteristic absorption features of each component of interest. Instead of measuring the intensity of each spectral element separately, the HTS concept involves simultaneously measuring a combination of several of

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Vibrational Relaxation in Liquids; some Applications of the Isotopic Dilution Method

Woerkom

Bieijser

Zwart

et al. 1974

Ber Bunsenges Phys Chem

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The isotopic dilution method is applied to study the influence of intermolecular vibrational relaxation on the IR correlation functions of some absorption bands of CH2Cl2, CHCl3 und CDCl3. The temperature dependent isotopic dilution effect is explained on the basis of intermolecular transition dipole‐transition dipole interaction, modulated by molecular reorientation. For these system a priori separation of independent rotational and vibrational correlation functions is not permitted according to the experimental results.

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Étude des mouvements moléculaires en milieu liquide au moyen de la largeur des bandes de vibration dans l’infrarouge

Cited by 6 publications

References 0 publications

Etude des mouvements de molécules linéaires en phase liquide par analyse du profil des bandes d'absorption infrarouge. I. Oxyde nitreux

Etude des mouvements de molécules linéaires en phase liquide par analyse du profil des bandes d'absorption infrarouge. I. Oxyde nitreux

Infrared Spectroscopy

Vibrational Relaxation in Liquids; some Applications of the Isotopic Dilution Method

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