摘要:

The absorption spectrum of the open-shell molecular ion SD+in itsX3Σ-ground state has been observed by the mid-infrared L.M.R. technique for the first time. Pure vibrational rotational transitions were detected with 53 CO-laser-lines and 120 Zeeman components were assigned to four vibrational rotational bands of the SD+ground state. The spectroscopic constants for the ground state were improved by at least an order of magnitude.

ISSN:0026-8976    

DOI:10.1080/00268978700100201

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A double modulation technique was developed for selective detection of open shell molecular ions. By employing this technique the vibration-rotation spectrum of DBr+in itsX2Π3/2ground state has been recorded. A new set of vibration-rotation molecular constants for both isotopic species D79Br+and D81Br+is given.

ISSN:0026-8976    

DOI:10.1080/00268978700100211

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Theb0+-X10+andb0+-X21 sub-systems of SeS have been recorded in emission in the near infrared with high resolution using a Bomem interferometer. The emission was excited by reacting ground state SeS molecules with metastable O2(1Δg) molecules.

ISSN:0026-8976    

DOI:10.1080/00268978700100221

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Depolarized Rayleigh-Brillouin scattering is used to investigate the isomers of the homologous alkane series n-pentane to n-octane. In addition to the low frequency lorentzian component, associated with molecular reorientation, a second lorentzian component is found in the spectra from the liquids 2,2,4-trimethylpentane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane, 2,2,3-trimethylbutane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, n-pentane and 2-methylbutane. The contribution to the spectra of this second lorentzian, which is broader than the lorentzian associated with molecular reorientation and distinct from the interaction induced component, reduces as the molecules become more anisotropic and flexible.

ISSN:0026-8976    

DOI:10.1080/00268978700100231

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The theory of spin relaxation induced by translational diffusion of small molecules or ions in locally ordered fluids, developed in parts I and II of this series, is extended to cylindrical geometry as, for example, in polyelectrolyte solutions or in hexagonal lyotropic liquid crystals. The theory is based on the Smoluchowski diffusion equation with nonuniform potential of mean force and translational diffusivity and on the cylindrical cell model. Formally exact closed-form expressions are derived for the zero-frequency spectral density associated with radial diffusion, while a general numerical algorithm is described for computing the full frequency-dependent spectral density. Several useful approximations, such as the dynamic cell approximation, the steady state approximation and the surface diffusion approximation, are formulated and their accuracy quantitatively assessed. Calculations are reported for a mean-field interaction model based on the nonlinear Poisson-Boltzmann equation, with emphasis on applications of the theory to counterion spin relaxation in polyelectrolyte solutions.

ISSN:0026-8976    

DOI:10.1080/00268978700100241

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Numerical calculations are presented for the fluorescent spectra arising from the interaction of a four-level atom with two strong laser fields, whose initially populated modes ωaand ωbare in resonance with three of the atomic transition frequencies. The excitation spectra near the frequencies ω = ±(2ωa- ωb) are computed and the relative intensity of the system is considered as a function of the parameter ξ = Ωb2/Ωa2, where Ωaand Ωbare the Rabi frequencies of the two laser fields, respectively. The computed spectra for different values of the Rabi frequencies are presented graphically and compared with those derived by analytical methods.

ISSN:0026-8976    

DOI:10.1080/00268978700100251

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Rotational line strength expressions are derived forn-photon transitions between two multiplet states of diatomic molecules which both belong to coupling cases that are intermediate between Hund's case (a) and case (b). Rotational selection rules forn-photon transitions are given. For doublet states, rotational line strengths are given in terms of coupling parameters, states with any multiplicity may be treated in the same way. Different kinds of transitions are discussed.

ISSN:0026-8976    

DOI:10.1080/00268978700100261

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Order parameters, as measured from N.M.R. experiments, are reported for a series of small rigid molecules dissolved in the liquid crystals N-(p-ethoxybenzylidene)-p′-n-butylaniline, Merck ZLI 1132, and a 55 wt per cent 1132 mixture of the two. Previous studies have shown that in this mixture the external electric field gradient due to the liquid crystal environment is zero at the site of the deuterium nucleus in D2. The order parameters are discussed in terms of a simple model for the interaction between the solute molecules and their liquid crystal environment. It is shown that the ordering of the solutes in the liquid crystal solvents can be largely explained in terms of: (i) the interaction between the molecular quadrupole moment of the solute and the average electric field gradient due to the solvent and (ii) the short range interactions between the solvent and solute which depend on the size and shape of the solute.

ISSN:0026-8976    

DOI:10.1080/00268978700100271

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In this article we present the application of a recently developed density functional theory for dipolar fluids to the case of dipolar hard sphere particles in contact with charged walls. We use simplifying local approximations to the electrostatic contributions to the free energy and also in an effective potential representation of dipole-dipole orientational correlations. Density and polarization profiles are obtained. We also calculate solvation forces and capacitances between two charged walls, finding significant solvent structure effects in both quantities.

ISSN:0026-8976    

DOI:10.1080/00268978700100281

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Here we extend the theoretical analysis presented in the previous paper to the case where the dipolar fluid is contained between charged walls, with all entities possessing dispersion attractions. A Stockmayer model representing hydrogen chloride is used for the fluid and the wall parameters are chosen to mimic solid carbon dioxide. The effect of an electric field on the capillary condensation of an HCl gas is investigated. At lower temperatures a solid-like layering transition seems to occur and here we observe interesting structural changes in that phase for variations of both the electric field and of the distance between the walls.

ISSN:0026-8976    

DOI:10.1080/00268978700100291

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor