Fast Time-Resolved Fourier Transform Spectroscopy With Rapid-Scan Interferometers

1989 ◽  
Author(s):  
J J. Sloan
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Spectroscopy ◽  
Fast Time ◽  
Time Resolved ◽  
Rapid Scan

The dynamics of the reaction of O(1D) with HBr studied by crossed molecular beams and time-resolved Fourier transform spectroscopy

1994 ◽  
Vol 72 (3) ◽  
pp. 888-902 ◽  
Author(s):  
N. Balucani ◽  
L. Beneventi ◽  
P. Casavecchia ◽  
G. G. Volpi ◽  
E. J. Kruus ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Large Fraction ◽  
Branching Ratio ◽  
Molecular Beams ◽  
Momentum Conservation ◽  
Fourier Transform Spectroscopy ◽  
Fast Time ◽  
Time Resolved ◽  
Vibrational Distribution ◽  
Crossed Molecular Beams

The reaction O(1D) + HBr has been investigated by the crossed molecular beams and infrared chemiluminescence methods in an effort to characterize the dynamics of both possible reactive channels. The angular and velocity distribution of the BrO product from the O(1D) + HBr → BrO + H pathway have been obtained in crossed beam experiments at collision energies, Ec, of 5.0 and 14.0 kcal/mol. The product center-of-mass angular distribution is found to be almost backward–forward symmetric at both Ec, with backward scattering being slightly favored, from which it is deduced that two processes contribute to this channel: a dominant one occurring via formation of a long-lived complex, following O(1D) insertion, and another one occurring via direct abstraction of the halogen atom and giving rise to a rebound dynamics. The large fraction (≈50%) of available energy released into translation indicates the existence of a potential barrier for H-displacement in the exit channel. From energy and angular momentum conservation arguments, it is inferred that BrO is formed rotationally very hot in the lowest vibrational levels of both 2Π3/2 and 2Π1/2 electronic states. The initial vibrational distribution of the OH product from the O(1D) + HBr → OH + Br channel has been measured using fast time-resolved Fourier transform spectroscopy. The vibrational distribution is strongly inverted, from which it is deduced that the HOBr intermediate dissociates very rapidly, before energy randomization occurs. A lower limit to the branching ratio of the relative cross sections for the BrO + H and OH + Br channels is derived (σ(BrO + H)/σ(OH + Br) ≥ 0.16 ± 0.07) and compared to recent bulk work. The dynamical results for the overall reaction are discussed with reference to the relevant singlet and triplet potential energy surfaces and possible molecular configurations involved. Comparison with the dynamics of the ground state reaction O(3P) + HBr → OH + Br is carried out also, to examine the effect of electronic excitation on the dynamics of the reactions of atomic oxygen with hydrogen halides.

Time-resolved FTIR study of CO recombination with horseradish peroxidase

2008 ◽  
Vol 36 (6) ◽  
pp. 1165-1168 ◽  
Author(s):  
Amandine Maréchal ◽  
W. John Ingledew ◽  
Peter R. Rich
Keyword(s):  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Horseradish Peroxidase ◽  
Rate Constants ◽  
Recombination Rate ◽  
Thermal Equilibrium ◽  
Time Resolved ◽  
Fourier Transform Ir Spectroscopy ◽  
Rapid Scan ◽  
Fourier Transform Ir

Vibrational changes associated with CO recombination to ferrous horseradish peroxidase were investigated by rapid-scan FTIR (Fourier-transform IR) spectroscopy in the 1200–2200 cm−1 range. At pH 6.0, two conformers of bound CO are present that appear as negative bands at 1905 and 1934 cm−1 in photolysis spectra. Their recombination rate constants are identical, confirming that they arise from two substates of bound CO that are in rapid thermal equilibrium, rather than from heterogeneous protein sites. A smaller positive band at 2134 cm−1 also appears on photolysis and decays with the same rate constant, indicative of an intraprotein geminate site involved in recombination or, possibly, a weak-affinity surface CO-binding site. Other signals arising from protein and haem in the 1700–1200 cm−1 range can also be time-resolved with similar kinetics.

Intracavity Cr4+ :YAG laser absorption analyzed by time-resolved Fourier transform spectroscopy

2005 ◽  
Vol 81 (8) ◽  
pp. 1143-1147 ◽  
Author(s):  
F. Gueye ◽  
E. Safari ◽  
M. Chenevier ◽  
G. Guelachvili ◽  
N. Picqué
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Spectroscopy ◽  
Time Resolved ◽  
Yag Laser ◽  
Laser Absorption
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