摘要:

The pulsed properties of synchrotron radiation are being applied extensively for subnanosecond timing studies. Measurements in the time domain take advantage of the well defined time structure, unique tunability, wavelength registration, and polarisation characteristics of synchrotron radiation. A description of the time modulation of synchrotron radiation is followed by a comparison between several subnanosecond timing techniques which have been used at the Synchrotron Radiation Source (SRS) at Daresbury. The present limitations of time-resolved fluorescence measurements and the broad range of possible applications of these methods, are illustrated by some selected examples. In the near future time-domain measurements will be improved to give a resolution of a few picoseconds and will be extended to include excitation over a range of wavelengths in the x-ray, vacuum ultraviolet and infra-red regions.

ISSN:1073-9149    

DOI:10.1080/10739148508543588

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Two novel techniques for the measurement of fluorescence lifetimes are discussed. The first method operates in the frequency domain, selectively amplifying the signals generated by the mode beats of a cw laser with a UHF television tuner. The second approach measures the fluorescence with simultaneous temporal and spectral resolution to simplify the characterization of complex samples.

ISSN:1073-9149    

DOI:10.1080/10739148508543589

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

We describe the recent progress made in our laboratory on the time-resolved fluorescence spectroscopy by the combination of stable short-duration pulses from a CW mode-locked laser and a time-correlated single-photon counting method. Particular emphasis is placed on the achievement of high time resolution with side-on and microchannel-plate photomultipliers. We also discuss the limitation of using this method in the picosecond time range. Several applications of this spectroscopy such as the measurements of fluorescence decay characteristics and time behavior of fluorescence depolarization are reported. It is also shown that the high sensitivity of this method with pico-second time resolution is very suitable for the temporal rejection of cumbersome background-fluorescence in Raman spectroscopy. Finally, we present a novel method of photon time-of-flight fluorescence spectroscopy, in which an optical fiber is employed as a dispersive element.

ISSN:1073-9149    

DOI:10.1080/10739148508543590

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The dynamic aspects of molecular structures at atomic resolution have become of increasing importance. The analysis of molecular motions of individual residues and structural domains of biomolecules is essential for an understanding of the functional aspects of biopolymers at the molecular level.

ISSN:1073-9149    

DOI:10.1080/10739148508543591

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:1073-9149    

DOI:10.1080/10739148508543577

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor