INFRARED-SPECTROSCOPY OF VIBRATIONALLY EXCITED HONO2 - SHEDDING LIGHT ON THE DARK STATES OF INTRAMOLECULAR VIBRATIONAL-ENERGY REDISTRIBUTION
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We present a MEMS infrared spectrometer for selective and quantitative chemical gas analysis. infrared absorption spectroscopy can distinguish gases easily and also detect nonreactive molecules like CO2, in contrast to e.g. metal oxide gas sensors The foll ...
We have measured an upper limit of 17 J/cm(2) for the threshold fluence for collision-fret CO2 laser IRMPD of silane by detecting the SiH2 product in its electronic and vibrational ground state. The threshold drops to similar to4 J/cm(2) when silane molecu ...
An atomic infrared (IR) streak camera is demonstrated that operates in the mid- and far-infrared (lambda = 5-85 um), web beyond the long wavelength cutoff of conventional streak cameras. The temporal and spectral characteristics of the streak camera are de ...
Institute of Electrical and Electronics Engineers1998
The vibrational properties of vitreous silica are discussed in light of recent results obtained using a first-principle approach. The high-frequency doublet appearing in the inelastic neutron spectrum results from different local modes of the tetrahedral s ...
Using a model structure consisting of a network of corner sharing tetrahedra, we calculate the infrared spectrum of amorphous SiO2 within a first-principles approach and find good agreement with experiment both for the positions and the intensities of the ...
An atomic streak camera has been constructed that operates from the near to the far infrared. The photocathode used in conventional streak cameras for the conversion of photons to electrons has been replaced by gas-phase atoms in a Rydberg state. The low b ...
State-selected spectra of the OH stretch overtones of methanol in the range of upsilon(1) = 3-8 reveal spectral splittings and broadenings that result from vibrational couplings within the molecule. We employ a two-color excitation technique in which an in ...
Glucose and lactate profiles in Chinese hamster ovary cell cultures were accurately monitored in real time and in situ during three bioreactor batch cultures lasting 11, 15, and 15 days performed within a 60-day period. Monitoring was accomplished using in ...
Compressibility of MgCO3 is studied with infrared absorbance in the 100-1800 cm(-1) wave number range. Large values of the Gruneisen parameters for the translational modes, related to the optically active mode in the B1 structure, indicate that the pressur ...
The simulation and characterization of a low-cost IR source are described. The IR emission is obtained from heated thin film resistors which are either self- suspended or deposited an a membrane, The simulation, performed with a finite difference method, s ...