Posts Tagged light
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
Spectrophotometry and Its Working Principle
Spectrophotometry is one of the most important practices carried out in physics laboratories. Spectrophotometry is the study of the reflection or transmission properties of a substance as a function of wavelength. It is the quantitative study of electromagnetic spectra of a material. During the process, the transmittance or reflectance of the substance is measured through the careful geometrical and spectral consideration.
To carry out spectrophotometry, a spectrophotometer is required. A spectrophotometer is a device or more specifically a photometer that is used to measure intensity of light as a function of the wavelength of light. Different types of spectrophotometers are found in the market. They are classified on various basis. The most important distinctions used to classify them are:
Tags: concentration, lab equipment, light, process, spectra, spectrometer, spectrophotometer, spectrophotometers, spectrum, study, wavelength, working principleRelated posts
Researchers Demonstrate Single Molecule Absorption Spectroscopy
A powerful new tool for probing molecular structure on surfaces has been developed by researchers at the University of Illinois at Urbana-Champaign. Single molecule absorption spectroscopy can enhance molecular analysis, surface manipulation and studies of molecular energy and reactivity at the atomic level.
“This new measurement method combines the chemical selectivity of optical absorption spectroscopy with the atomic-scale resolution of scanning tunneling microscopy,” said Martin Gruebele, a professor of chemistry, physics and biophysics and corresponding author of a paper accepted for publication in the journal Nano Letters, and posted on its Web site. “The method literally feels how a molecule changes shape when it absorbs energy.”
Tags: absorption spectroscopy, fluorescence, fluorescence spectroscopy, institute, journal, laser, light, molecule, molecules, optical, professor, research, scale, science, single molecule, single molecule fluorescence, special, spectroscopy, study, university, university ofRelated posts
Spectrometer Measures Auroras' Impact On Ionosphere
A new imaging spectrometer developed at the University of Illinois will assist scientists who are studying auroras and their effects upon Earth’s atmosphere. By discerning spectral characteristics of auroral emissions as a function of altitude, the instrument will aid in the verification and refinement of atmospheric chemistry models.
Commonly referred to as “northern lights” or “southern lights,” auroras form over Earth’s magnetic poles when charged particles in the solar wind bombard atoms in the ionosphere. The excited atoms release their energy in the form of light — often as shimmering curtains or pulsing filaments. The solar magnetic storms that create these ribbons of light can disrupt power grids in northern Canada and wreak havoc with communications systems that propagate signals through the ionosphere.
Tags: auroras, earth, ionosphere, light, optical, optics, process, professor, research, science, spectra, spectrometer, student, study, university, university ofRelated posts