摘要:

Electronic spectrum of the diatomic molecule CaF was investigated in thermal emission using a high temperature vacuum graphite furnace. The ultraviolet system C2Π - ×2Σ for which only fragmentary data were available so far, was recorded in much extended form with bands showing clear multiplet sub-heads. In other systems too, numerous new sequences and additional bands have been reported.

ISSN:0038-7010    

DOI:10.1080/00387017308065441

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Band spectra of two hitherto unknown diatomic emitters - CrS and MnS have been observed in thermal emission using a vacuum graphite furnace. While the spectrum attributed to CrS lies in the spectral region λλ3860 - 4650, MnS bands fall in the region λλ4200 - 5900. Vibrational analyses of the bands observed in both the cases give spectroscopic constants which tally nicely with the mass-spectrometric data.

ISSN:0038-7010    

DOI:10.1080/00387017308065442

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The absorption and luminescence spectra of N,N-dialkyl-p-cyanoanilines are reported. A weak absorption band at ∼ 29000cm−1is assigned to a self-complex of these molecules. Assuming a dimeric form for the self-complex, the association constant is 50 ≤ K ≤ 150 l/m. Excitation in the self-complex absorption region produces a phosphorescence and fluorescence which are at lower energies than the corresponding monomer luminescences; the new emissions are assigned to T1D←1S0Dand1S1D←1S0Devents in the self-complex. The energies of, and transition probabilities in the self-complex are rationalized using a dimer stoichiometry and a model based on dipole-dipole interactions of static and transition moment type.

ISSN:0038-7010    

DOI:10.1080/00387017308065443

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The infrared characteristics of aromatic-N-oxides and their correlations with other structural properties have been investigated in some details in monocyclic compounds, especially pyridine-N-oxides. However the amount of infrared observational data available in more complex systems is rather limited and its interpretation still mostly tentative (1).

ISSN:0038-7010    

DOI:10.1080/00387017308065444

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The advent of organic dye lasers made possible many experiments in physics, chemistry and biology. Most of these applications are based on the possibility to tune dye laser emission almost at any wavelength between 3400 Å and 12000 Å.This quality combined with high light power made feasible multiphotone absorption, selective absorption and fluorescence experiments. Recently a group of authors published the papers: “Enhancement of absorption spectra by dye laser quenching I and II”1,2which start a new field of applications of dye lasers. Namely if a weak absorber is placed inside the broad band laser cavity the absorption is enhanced and this results in the same absorption bands or lines observable in the spectrally resolved laser output. This effect can be used for detection of the traces of elements as a complementary method to the classical absorption spectroscopy but with much higher sensitivity. Same method could be also very useful for detection of transient species with a very short lifetimes.

ISSN:0038-7010    

DOI:10.1080/00387017308065445

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

We have previously described qualitative measurements concerning the feasibility of atomic absorption spectrometry of mercury at 184.9nm (1). This communication describes the analytical utility of such measurements together with some atomic emission studies using a conventional monochromator system purged with an inert gas to prevent absorption of radiation by oxygen.

ISSN:0038-7010    

DOI:10.1080/00387017308065446

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The compound (GeF2)3GeF4has only recently been characterized1. A number of the physical and chemical properties of (GeF2)3GeF4are now known, including among others, its thermal behaviour and enthalpy of formation. The Raman spectrum and broadline NMR spectrum have not been presented and in this report they are described for the first time.

ISSN:0038-7010    

DOI:10.1080/00387017308065447

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The validity of dissociation constants of electronically excited acids and bases, calculated from spectral shifts1,2accompanying protolytic dissociation, especially where shifts of fluorescence spectra are employed, is dependent, among other factors, upon fluorescence orginating from excited states of the same electronic configuration in both acid and conjugate base.3In some of the molecules whose excited state acid-base properties have been most extensively studied, notably some derivatives of naphthalene, energy level reversals have been shown to accompany dissociation in the lowest excited singlet state in aqueous solutions.4The spectroscopic properties and excited state dissociation phenomena of the naphthols have been studied extensively from several points of view.5-9While the calculation of the excited state dissociation properties of β-naphthol, in which fluorescence occurs from the1Lbstate in both anion and neutral molecule, presents no particular problem with regard to correspondence of the lowest excited singlet states of conjugate acid and base, it appeared that in α-naphthol, by analogy with α-naphthylamine4, fluoescence might occur from the1Lastate in the conjugate base and from the1Lbstate in the conjugate acid. Thus it seemed that a careful consideration of the states from which the fluorescences of the conjugate species derived from α-naphthol in fluid aqueous solutions orginated, would be useful.

ISSN:0038-7010    

DOI:10.1080/00387017308065448

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0038-7010    

DOI:10.1080/00387017308065440

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor