Time-resolved Fourier-transform infrared and visible luminescence spectroscopy of photoexcited porous silicon

1999 ◽  
Vol 59 (7) ◽  
pp. 5026-5031 ◽  
Author(s):  
Jianping Wang ◽  
Li Song ◽  
Bingsuo Zou ◽  
Mostafa A. El-Sayed
Keyword(s):  
Fourier Transform ◽  
Porous Silicon ◽  
Fourier Transform Infrared ◽  
Luminescence Spectroscopy ◽  
Time Resolved ◽  
Visible Luminescence

Dependence of the intrinsic phase structure of Bi2O3 catalysts on photocatalytic CO2 reduction

2021 ◽  
Vol 11 (6) ◽  
pp. 2021-2025
Author(s):  
Liujin Wei ◽  
Guan Huang ◽  
Yajun Zhang
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Phase Structure ◽  
Co2 Reduction ◽  
Fourier Transform Infrared ◽  
Time Resolved ◽  
Dependent Activity

The combination of time-resolved transient photoluminescence with in-situ Fourier transform infrared spectroscopy has been conducted to investigate the intrinsic phase structure-dependent activity of Bi2O3 catalyst for CO2 reduction.

Real-Time Pursuit of Crystal Growth by Millisecond Time-Resolved Multichannel Fourier Transform Infrared Spectroscopy

1998 ◽  
Vol 52 (2) ◽  
pp. 222-225
Author(s):  
Mamoru Hashimoto ◽  
Hiro-O Hamaguchi
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Structural Change ◽  
Liquid Phase ◽  
Fourier Transform Infrared Spectroscopy ◽  
Molecular Orientation ◽  
Structural Changes ◽  
Fourier Transform Infrared ◽  
Time Resolved ◽  
Recovery Curves

The surface (about 130 molecular layers) of an oriented thin crystal of decanoic acid was subjected to sudden melting by a laser-induced temperature jump (T-jump), and the process of subsequent crystal re-growth was monitored by millisecond time-resolved multichannel Fourier transform infrared spectroscopy. The gauche–trans structural change of the alkane part of the molecule has been probed by the CH stretch bands in the 2800–3000 cm−1 region. The change in the molecular orientation has been detected by the OH stretch band around 3065 cm−1. The recovery curves for the CH2 antisymmetric stretch and the OH stretch bands are markedly different from each other in the first 200 ms, suggesting that the gauche–trans structural changes precedes the crystal re-growth. After 500 ms, the recovery curves become identical. This result means that the rate of the gauche to the trans structural change is equal to the rate of the recovery of the molecular orientation. It is highly likely that a fast equilibrium is attained between the gauche and the trans conformations in the liquid phase after 500 ms from the sudden melting and that the crystal re-growth takes place solely via the all-trans structure in the liquid phase.

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