Posts Tagged scale
Grace in Home Schooling – Learning at Home
Home schooling opens doors to many changes in both a child’s world and in the lives of parents. The choice to home school weighs in with many considerations. Significant issues from adequate socialization to academic resources tip the scales of those pros and cons not unfamiliar to many people. Ultimately, for those who choose this path, a grace centered home schooling attitude can smooth out any rough edges typical of this profoundly life-altering choice.
What Home Schooling Requires
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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.”
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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.”
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Tiny Spectrometer Offers Precision Laser Calibration
A tiny device for calibrating or stabilizing precision lasers has been designed and demonstrated at the National Institute of Standards and Technology (NIST). The prototype device could replace table-top-sized instruments used for laser calibration in atomic physics research, could better stabilize optical telecommunications channels, and perhaps could replace and improve on the precision of instrumentation used to measure length, chemicals or atmospheric gases.
The new spectrometer, described in the May 7 issue of Optics Express,* is the latest in a NIST series of miniaturized optical instruments such as chip-scale atomic clocks and magnetometers. The spectrometer is about the size of a green pea and consists of miniature optics, a microfabricated container for atoms in a gas, heaters and a photodetector, all within a cube about 10 millimeters on a side. The package could be used to calibrate laser instruments, or, if a miniature laser were included in the device, could serve as a wavelength or frequency reference.
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