Study of dynamic processes by impulse response photoacoustic spectroscopy

The Analyst ◽  
1989 ◽  
Vol 114 (5) ◽  
pp. 547 ◽  
Author(s):  
Richard M. Miller ◽  
Graham R. Surtees ◽  
Christopher T. Tye
Keyword(s):  
Impulse Response ◽  
Photoacoustic Spectroscopy ◽  
Dynamic Processes

The study of time-dependent phenomena in materials by impulse-response photoacoustic spectroscopy

1986 ◽  
Vol 64 (9) ◽  
pp. 1146-1149 ◽  
Author(s):  
Richard M. Miller ◽  
Graeme R. Surtees ◽  
Christopher T. Tye ◽  
Ian P. Vickery
Keyword(s):  
Impulse Response ◽  
Photoacoustic Spectroscopy ◽  
Time Dependent ◽  
Plant Leaf

The use of impulse-response photoacoustic signals to monitor time-dependent changes in physicochemical systems is described. The diffusion of a dye through a polymer and the effect of a herbicide on a plant leaf are used to demonstrate the viability of the technique.

Impulse response photoacoustic spectroscopy of biological samples

The Analyst ◽  
1984 ◽  
Vol 109 (11) ◽  
pp. 1443 ◽  
Author(s):  
Gordon F. Kirkbright ◽  
Richard M. Miller ◽  
Dominic E. M. Spillane ◽  
Ian P. Vickery
Keyword(s):  
Impulse Response ◽  
Biological Samples ◽  
Photoacoustic Spectroscopy

Surface reactions observed by photoemission electron microscopy (PEEM)

1992 ◽  
Vol 50 (1) ◽  
pp. 286-287
Author(s):  
H.H. Rotermund
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Work Function ◽  
Chemical Reactions ◽  
Reaction Diffusion ◽  
Dynamic Processes ◽  
Clean Surface ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Photoemission Electron

Chemical reactions at a surface will in most cases show a measurable influence on the work function of the clean surface. This change of the work function δφ can be used to image the local distributions of the investigated reaction,.if one of the reacting partners is adsorbed at the surface in form of islands of sufficient size (Δ>0.2μm). These can than be visualized via a photoemission electron microscope (PEEM). Changes of φ as low as 2 meV give already a change in the total intensity of a PEEM picture. To achieve reasonable contrast for an image several 10 meV of δφ are needed. Dynamic processes as surface diffusion of CO or O on single crystal surfaces as well as reaction / diffusion fronts have been observed in real time and space.

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