Posts Tagged raman
Multidimensional Technique Enhances Vibrational Spectroscopy
By combining ultrashort pulses from a mid-infrared laser with pulses of visible light, chemists at the University of Illinois have added an important new dimension to vibrational spectroscopy. The new spectroscopic technique allows researchers to investigate vibrational energy redistribution in molecules with unprecedented detail.
“Molecules have specific vibrational motions, which can be used as spectral fingerprints,” said Dana Dlott, a UI professor of chemistry. “Our spectroscopic method allows us to monitor vibrational energy flow through a molecule on femtosecond time scales. We can therefore characterize the dynamic mechanical properties of molecules in real time — which is important in virtually every chemical process and of special interest in the field of nanotechnology, where machines will be the size of molecules.”
Tags: dana dlott, infrared, infrared spectroscopy, laser, light, molecule, molecules, nanotechnology, print, process, professor, raman, research, scale, special, spectra, spectroscopy, spectrum, student, study, university, university of, vibrational spectroscopyRelated posts
Modern UV-VIS Spectroscopy: A Decade of Fiber-Optic CCD Array Spectrophotometers
Ultraviolet-visible spectroscopy continues to be one of the core disciplines practiced in nearly every analytical laboratory. Since its inception by Cary and Beckman in the 1940s, UV-VIS spectroscopy has revolutionized the field of molecular spectroscopy. Over the decades, numerous improvements have been made with respect to optical designs, including dual-beam optics, variable slit resolution, noise suppression, and integrated electronics.
The proliferation of personal computers in the 1980s resulted in significant improvements in data acquisition and instrument control. Streamlined instrument operation was facilitated through the use of dedicated software applications and the introduction of the user-friendly Windows™ operating systems (Microsoft, Redmond, WA). Perhaps the most radical instrument design change that took place in the 1980s was the introduction of the diode array spectrophotometer by Hewlett-Packard, now Agilent Technologies (Palo Alto, CA). In contrast to traditional scanning monochromators that utilize a single photomultiplier tube, this novel spectrograph consisted of an array of photodiodes that permitted simultaneous, full-spectrum data acquisition in seconds. It was an instant hit among users.
Tags: criminal, design, fiber optic, fiber optics, fluorescence, graphic, light, molecular spectroscopy, monochromator, on line, optical, optical fiber, optics, photon, photonics, print, quality, raman, research, spectra, spectrograph, spectrometer, spectrometers, spectrophotometer, spectrophotometers, spectroscopy, spectrum, teach, teaching, vis spectrophotometer, visible spectroscopy, wavelengthRelated posts