2 edition of The auroral green spectral line and the raman effect in liquefied gases. found in the catalog.
The auroral green spectral line and the raman effect in liquefied gases.
John Henry McLeod
Written in English
Thesis (Ph.D.) -- University of Toronto, 1929
|The Physical Object|
the bond are Raman active. IR and Raman activity are complimentary and the two techniques are used to fully characterize the vibrational states of molecules. Raman scattering is based on a scattering event as described above. Figure of Campbell and White shows a schematic of a Raman spectrometer. The vibrational spectral analysis of H 3 Po 4 by Chapman et al (44,45) shows only r:rrong Raman band at cm-l in the region-1 between and cm. However, the IR and Raman spectra of AP show a number of strong bands with significant changes in positions and intensities. A comparison of the intensity distribution.
This is a guest essay by Mike Jonas, part 1 of 4. Introduction. The aim of this article is to provide simple mathematical formulae that can be used to calculate the carbon dioxide (CO2) contribution to global temperature change, as represented in the computer climate models. Understanding the Raman spectral features to cm 1 relative to the nm laser line. The spectrometer has a spectral resolution of 4–5cm 1 and uses a × pixel array Charge-Coupled Device (CCD) camera for recording Raman spectra. The nm laser radiation is sent through a single-mode ing Raman resonance effects. Some laser.
Effect of Impurities on Raman and Photoluminescence Spectra of AlN Bulk Crystals - Volume - A. Sarua, S. Rajasingam, M. Kuball, N. Garro, O. Sancho, A. Cros, A. The Use of a Raman Spectral Database of Minerals for the Rapid Verification of Semiprecious Gemstones Raman spectroscopy is a frequently used analytical technique in the field of geosciences because it can reveal a great deal about the chemical makeup and structure of a mineral (1).
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However, Raman spectra use an energy related unit (Raman shift, or wavenumber, cm-1) which means that the spectral resolution decreases as the laser excitation is changed from infra-red to visible to ultra-violet wavelengths. As an example, if a gr/mm grating is used with an infra-red laser, a gr/mm or gr/mm will be required with a.
the auroral line of λ = Å was sufficiently close to make the identification convincing (16). Marshall Watts, an English meteorologist, was even more confi-dent; in he concluded (17): There seems now little doubt that the chief line of the aurora, i.e., Ångström’s green line.
Normal and resonance Raman effects in gaseous chlorine were carefully studied with a powerful argon ion laser. No resonance Raman behaviour could be detected in the spectra excited by visible laser lines with wavelengths down to Å.
The fine structures of the normal Raman spectra were by: 1. Introduction. Transient hole burning and Raman heterodyne signals in the nitrogen vacancy (NV) centre of diamond have been reported for some time,, but there has not been an entirely satisfactory account given of the origin of such signals.
What is known is that the NV centre exhibits long-lived photophysical hole burning due to reorientation of the vacancy-nitrogen pair along Cited by: Raman contours corresponding to the OD and OH stretching vibrations from HDO, as well as from H 2 O and D 2 O, were obtained at 25°C from a series of ternary aqueous solutions containing HDO, ClO 4 − (Li +, Na +, K +), and H 2 O or D 2 O.
The Raman spectra were obtained photoelectrically using ‐Å argon‐ion‐laser excitation, as well as conventional ‐Å mercury by: The available Raman spectral data on terpenic compounds are tabulated and reviewed. It is concluded that the identification of the constituents of a mixture of terpenes by Raman effect methods cannot give trustworthy results until confirmatory results on possible constituents have been obtained.
cases), which enhances the effect of spectral broadening of the radiation through turbulent-like FWM modal interaction . In this Letter we perform an experimental and numerical study on the impact of nonlinear spectral broadening on the efficiency of URFLs with cavity lengths varying from several km up to a maximum length of km.
Very good question, John. Indeed, comprehending the Origin of Gaussian and/or Lorentzian Line Shapes in the solid state Raman experiment is very important for practicing spectroscopist. Most commercial gaseous and liquid fuels are mixtures of multiple chemical compounds.
In recent years, these mixtures became even more complicated when the suppliers started to admix biofuels into the petrochemical basic fuels.
As the properties of such mixtures can vary with composition, there is a need for reliable analytical technologies in order to ensure stable operation of devices such. Quantitative spectroscopy of the aurora. The auroral spectrum from to nm observed by the OSIRIS spectrograph on board the Odin spacecraft.
Gattinger, a A. Vallance Jones, b D. Degenstein, a E. Llewellyn a. a ISAS, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada. A number of factors may lead to this effect. If the mode belongs to single crystalline lattice than increase means that crystallinity increases, i.e.
the size of crystallites grows. though the Ha line at nm is the brightest Balmer line, its spectral proximity to the bright N 2 first positive and the OH airglow bands makes it difficult to obtain unambiguous line profiles. Therefore the spectral profile of the Balmer line Hb at nm is the most commonly used in the study of proton aurora [Zwick and Shepherd, the exact position with respect to the usefulness of Raman spectral methods as applied to certain types of chemical substances is frequently uncertain.
One group of substances for which a large volume of scattered data has been recorded is the terpenes and, arising from conversations with Professor J. The Raman spectra of the ions ReCl 6 2−, ReBr 6 2− and OsCl 6 2− in solution are observed, using He lines for excitation. For the chloro-ions the fundamental ν 2 is too weak to be observed: for ReBr 6 2− it is weak but observable.
The infra-red spectra of the ions as mulls of their caesium salts are studied in the range from 90 cm −1 upwards. In all cases the fundamentals ν 4 and. Detection of Brucella, causing brucellosis, is very challenging, since the applied techniques are mostly time-demanding and not standardized.
While the common detection system relies on the cultivation of the bacteria, further classical typing up to the biotype level is mostly based on phenotypic or genotypic characteristics.
The results of genotyping do not always fit the existing taxonomy. Raman spectroscopy has become a workhorse  technology in the pharmaceutical industry, and new applications are emerging rapidly.
Many of these applications involve the use of Raman libraries for material identification and verification. Raman spectroscopy differs in several important respects from absorbance spectrometry. Reliable spectral observations were not obtained until At the time of the eclipse ofmeasurements of the green line showed that for the past thirty years identity had been assumed with the chromospheric line at Å while in reality the green coronal line was approximately 14 Å units toward the violet end of the spectrum.
Integrated intensities of the cm -1 intermolecular Raman bands from water and ̃2M aqueous solutions of urea and sucrose were obtained. The intensity data and the stoichiometric water molarities of the solutions were then employed in conjunction with an operational definition to obtain information related to ``structure-breaking'' and ``structure-making'' effects.
14 ⋅ Shape of Spectral Lines In practice, all these effects are present and give the line its characteristic shape. The correct representation of these effects allows for the calculation of the observed line profile and in the process reveals a great deal about the conditions in the star that give rise to the spectrum.
Initial comparisons suggest that the plasma line theory, when applied to low altitudes, must include the effect of electron‐neutral collisions.
When this is done, the good agreement obtained between theory and experiment indicates the promise of this approach for the study of low‐energy auroral electrons.
The antimicrobial effects of garlic (Allium sativum) extract (25, 50, 75,and μl/ml) and diallyl sulfide (5, 10 and 20 μM) on Listeria monocytogenes and Escherichia coli OH7 cultivated in tryptic soy broth at 4, 22 and 35°C for up to 7 days were investigated.L.
monocytogenes was more resistant to garlic extract and diallyl compounds treatment than E. coli OH7.ever, turned the samples too dark to give a Raman spectrum with ex-citation by A He-Ne laser radiation. The molecular structure is known from electron diffraction studies of the gases (Lu and Donohue ).
The structure of realgar was deter-mined by X-ray diffraction bv lto et al. (), and of orpiment b1'these.Line profiles. A great deal of information can be extracted by detailed examination of spectral lines, such as redshift, radial velocity, expansion velocity, temperature, and much more.
This section will grow as more authors cover particular spectral methods that appear in the literature. P Cygni profiles.