scholarly journals Comments on the R(ν̄) spectral representation of the low frequency Raman spectrum

1981 ◽  
Vol 75 (3) ◽  
pp. 1586-1587 ◽  
Author(s):  
O. Faurskov Nielsen ◽  
P.‐A. Lund ◽  
E. Praestgaard
Keyword(s):  
Raman Spectrum ◽  
Spectral Representation ◽  
Low Frequency

Errata: Low Frequency Raman Spectrum of Calcite

1948 ◽  
Vol 16 (7) ◽  
pp. 668-668
Author(s):  
L. Giulotto ◽  
G. Olivelli
Keyword(s):  
Raman Spectrum ◽  
Low Frequency

scholarly journals A Simple Calibration Method of Anti-Stokes–Stokes Raman Intensity Ratios Using the Water Spectrum for Intracellular Temperature Measurements

2020 ◽  
Vol 74 (10) ◽  
pp. 1295-1296
Author(s):  
Yuki Yoshikawa ◽  
Shinsuke Shigeto
Keyword(s):  
Raman Spectrum ◽  
Low Frequency ◽  
Practical Method ◽  
Calibration Method ◽  
Temperature Measurements ◽  
Raman Shift ◽  
Acquisition Time ◽  
Boltzmann Factor ◽  
Intensity Ratios ◽  
Anti Stokes

Presented here is a facile and practical method for calibrating anti-Stokes–Stokes intensity ratios in low-frequency Raman spectra that is devised specifically for temperature measurements inside cells. The proposed method uses as an intensity standard the low-frequency Raman spectrum of liquid water, a major molecular component of cells, whose temperature is independently measured with a thermocouple. Rather than calibrating pixel intensities themselves, we obtain a correction factor at each Raman shift in the 20–200 cm−1 region by dividing the anti-Stokes–Stokes intensity ratio calculated theoretically from the Boltzmann factor at the known temperature by that obtained experimentally. The validity of the correction curve so obtained is confirmed by measuring water at other temperatures. The anti-Stokes–Stokes intensity ratios that have been subjected to our calibration are well fitted with the Boltzmann factor within ∼1% errors and yield water temperatures in fairly good agreement with the thermocouple temperature (an average difference ∼1 ℃). The present method requires only 15 min of spectral acquisition time for calibration, which is 50 times shorter than that in a recently reported calibration method using the pure rotational Raman spectrum of N2. We envision that it will be an effective asset in Raman thermometry and its applications to cellular thermogenesis and thermoregulation.

Pressure tuning spectroscopy of the low‐frequency Raman spectrum of liquid amides

1993 ◽  
Vol 99 (8) ◽  
pp. 5736-5741 ◽  
Author(s):  
K. Goossens ◽  
L. Smeller ◽  
K. Heremans
Keyword(s):  
Raman Spectrum ◽  
Low Frequency ◽  
Pressure Tuning

Intermolecular Vibrations in Fullerene Systems

1994 ◽  
Vol 359 ◽  
Author(s):  
M.G. Mitch ◽  
G.P. Lopinski ◽  
J.S. Lannin
Keyword(s):  
Raman Spectrum ◽  
Alkali Metal ◽  
Raman Scattering ◽  
Octahedral Site ◽  
Low Frequency ◽  
Bulk Materials ◽  
Complementary Information ◽  
Disorder Effects ◽  
Site Disorder ◽  
Intermolecular Vibrations

ABSTRACTIntermolecular vibrations in a variety of fullerene systems are reported that provide information on C60-C60 and alkali-metal - C60 interactions and disorder effects. Low frequency Raman scattering in laser polymerized C60 films are shown to exhibit additional modes not reported for bulk materials. This result is consistent with recent dimer calculations. Raman scattering and HREELS measurements are shown to provide complementary information on alkali-metal motions in K3C60. In FCC Na6C60 both octahedral site disorder effects and reduced Na-C bond lengths account for changes in the Raman spectrum relative to Na3C60.

scholarly journals On the Dielectric and Magnetic Properties of Nanocomposites

2007 ◽  
Vol 2007 ◽  
pp. 1-11 ◽  
Author(s):  
B. Hallouet ◽  
B. Wetzel ◽  
R. Pelster
Keyword(s):  
Molecular Dynamics ◽  
Magnetic Properties ◽  
Polymer Matrix ◽  
Magnetite Nanoparticles ◽  
Particle Concentration ◽  
Spectral Representation ◽  
Low Frequency ◽  
Magnetic Data ◽  
Model Free ◽  
Effective Medium Models

We investigate nanocomposites, that is, dispersions of magnetite nanoparticles in an epoxy resin, by means of broadband dielectric and magnetic spectroscopy. The molecular dynamics of the polymer matrix is altered by the nanoparticles. Due to the formation of agglomerates neither permittivity nor permeability can be described with known effective medium models. We use the spectral representation (Bergman theorem) to show that a model-free evaluation of the low-frequency permeability of the nanoparticles can be achieved by combining dielectric and magnetic data. In addition, the ferromagnetic resonance is studied experimentally. It occurs near 3 GHz and is independent of the particle concentration.

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