Photoelectric recording of spontaneous raman spectra excited with a He-Ne laser

1971 ◽  
Vol 14 (4) ◽  
pp. 551-552
Author(s):  
G. I. Oleneva ◽  
A. A. Levin ◽  
V. A. Shlyapochnikov
Keyword(s):  
Raman Spectra ◽  
Photoelectric Recording

The Raman and infra-red spectra of carbon suboxide

1954 ◽  
Vol 223 (1153) ◽  
pp. 251-266 ◽  
Keyword(s):  
Raman Spectrum ◽  
Raman Spectra ◽  
Malonic Acid ◽  
Mass Spectra ◽  
Linear Molecule ◽  
Molecular Symmetry ◽  
Carbon Suboxide ◽  
Photoelectric Recording ◽  
Infra Red

The infra-red and Raman spectra of carbon suboxide have been redetermined since earlier data did not permit an unequivocal decision as to the molecular symmetry. The infra-red spectrum of the gas was measured over the range 275 to 4600 cm -1 using a Perkin-Elmer spectrometer. The Raman spectrum of the liquid (at — 90° C) was investigated using a photoelectric recording spectrometer constructed in this laboratory. No trouble was experienced with decomposition of the sample. The purity of the suboxide which was prepared from malonic acid was carefully checked by following changes in the infra-red and mass spectra at various stages of the purification. In this way several bands previously attributed to the suboxide were shown to be due to impurities. Details of a normal co-ordinate treatment are given, and with its aid all the observed bands are given satisfactory assignments on the basis of a linear molecule, symmetry D ∞λ . This necessitates the postulation of one infra-red active fundamental at about 198 cm -1 . Though this lies outside the region investigated here it has recently been observed by O’Loane in the course of investigations on a series of compounds in the far infra-red.

The resolution of adjacent spectral lines in the photoelectric recording of Raman spectra

1966 ◽  
Vol 5 (3) ◽  
pp. 253-255
Author(s):  
A. N. Mogilevskii ◽  
V. A. Slavnyi ◽  
T. E. Abramovich
Keyword(s):  
Raman Spectra ◽  
Spectral Lines ◽  
Photoelectric Recording

Single Crystal Raman Spectra of the Phase Transition in KTCNQ

1982 ◽  
Vol 85 (1) ◽  
pp. 297-303 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Raman Spectra

What are the ranges and basis of auxeticity in the phases of cellulose microfibrils?

2017 ◽  
Author(s):  
Akwasi Asamoah
Keyword(s):  
Bacterial Cellulose ◽  
Raman Spectra ◽  
Laser Power ◽  
Microfibrillated Cellulose ◽  
Glass Slide ◽  
Flax Fibre ◽  
Cellulose Microfibrils

<p>One sample of 1D bundle of cellulose microfibrils in the form of lignified flax fibre (0.10526 mm x 10 mm), and one 2D networks of cellulose microfibrils in the form of tunicate cellulose (0.07 mm x 5 mm x 10 mm), bacterial cellulose (0.135 mm x 5 mm x 10 mm) and microfibrillated cellulose (0.08 mm x 5 mm x 10 mm) were put on a glass slide parallel to the principal spectrometer axis. Raman spectra were measured all round in-plane under both half (in 5° steps) polarisation from 0° to 360° in extended mode between 100 cm<sup>-1</sup> and 1150 cm<sup>-1</sup> in 3 accumulations at 10s exposure and 100% laser power. The cursor was placed at the peak of the 1095 cm<sup>-1</sup> band, and intensity read.</p>

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