Fermi Resonance of H2O as a Temperature Indicator or Probe of Biological Samples in the Exciting Beam of a Laser Raman Spectrometer

1987 ◽  
Vol 41 (6) ◽  
pp. 1068-1069 ◽  
Author(s):  
Halina Baranska ◽  
Anna Łabudzinska
Keyword(s):  
Biological Samples ◽  
Fermi Resonance ◽  
Raman Spectrometer ◽  
Laser Raman ◽  
Exciting Beam

Laser Raman Spectrometer for Process Control

1973 ◽  
Vol 12 (9) ◽  
pp. 2083 ◽  
Author(s):  
Arieh M. Karger ◽  
Richard P. English ◽  
Ray J. D. Smith
Keyword(s):  
Process Control ◽  
Raman Spectrometer ◽  
Laser Raman

A pulsed dye laser Raman spectrometer employing a new type of gated analogue detection

1981 ◽  
Vol 14 (12) ◽  
pp. 2189-2197 ◽  
Author(s):  
E Campani ◽  
G Gorini ◽  
G Masetti
Keyword(s):  
Dye Laser ◽  
Pulsed Dye Laser ◽  
Raman Spectrometer ◽  
Laser Raman ◽  
New Type

Adaptation of a Commercially Available Laser Raman Spectrometer for Underwater Chemical Sensing

2019 ◽  
Author(s):  
Jing-Heng Huang ◽  
Yen-Huang Liu ◽  
Kun-Sheng Lee ◽  
Shuo-Yen Tseng ◽  
Chyun-Cheng Wang ◽  
...  
Keyword(s):  
Chemical Sensing ◽  
Raman Spectrometer ◽  
Laser Raman

Slitless Optical-Fiber Laser-Raman Spectrometer Employing a Concave Holographic Grating

1977 ◽  
Vol 31 (4) ◽  
pp. 295-298 ◽  
Author(s):  
George E. Walrafen
Keyword(s):  
Optical Fiber ◽  
Fiber Laser ◽  
Numerical Aperture ◽  
Fused Silica ◽  
Holographic Grating ◽  
Photomultiplier Tube ◽  
Solid Core ◽  
Raman Spectrometer ◽  
Focal Line ◽  
Laser Raman

A slitless optical-fiber laser-Raman spectrometer has been developed that employs a single f/3 concave holographic diffraction grating. The exit end of an optical fiber is positioned at the grating focus, and the divergent excitation and Raman radiation are then dispersed and refocussed. Detection is accomplished by translating an exit slit and photomultiplier tube along the focal line. A moveable solid-core optical fiber that transmits light to a fixed photomultiplier tube may also be used. The holographic grating produces a straight focal line, instead of a curve, resulting in accurate focussing from 480 to 650 nm, with linear scanning. The low f-number grating was used to accommodate high numerical aperture optical fibers without loss of light. A comparison between the present spectrometer with a 55 m fused silica fiber and a Jarrell-Ash Czerny-Turner single monochromator using a 1-cm bulk sample indicates a signal/noise improvement by a factor of 137 for the very weak two-phonon band from fused silica near 1600 cm−1.

Thermal degradation of organic material by portable laser Raman spectrometry

2012 ◽  
Vol 11 (3) ◽  
pp. 177-186 ◽  
Author(s):  
Sanjoy M. Som ◽  
Bernard H. Foing
Keyword(s):  
Thermal Degradation ◽  
Biological Samples ◽  
Signal To Noise Ratio ◽  
Power Level ◽  
Laser Wavelength ◽  
Planetary Exploration ◽  
Integration Time ◽  
Raman Spectrometry ◽  
Laser Raman ◽  
Higher Power

AbstractRaman spectrometry has been established as an instrument of choice for studying the structure and bond type of known molecules, and identifying the composition of unknown substances, whether geological or biological. This versatility has led to its strong consideration for planetary exploration. In the context of the ExoGeoLab and ExoHab pilot projects of ESA-ESTEC & ILEWG (International Lunar Exploration Working Group), we investigated samples of astrobiological interest using a portable Raman spectrometer lasing at 785 nm and discuss implications for planetary exploration. We find that biological samples are typically best observed at wavenumbers >1100 cm−1, but their Raman signals are often affected by fluorescence effects, which lowers their signal-to-noise ratio. Raman signals of minerals are typically found at wavenumbers <1100 cm−1, and tend to be less affected by fluorescence. While higher power and/or longer signal integration time improve Raman signals, such power settings are detrimental to biological samples due to sample thermal degradation. Care must be taken in selecting the laser wavelength, power level and integration time for unknown samples, particularly if Raman signatures of biological components are anticipated. We include in the Appendices tables of Raman signatures for astrobiologically relevant organic compounds and minerals.

scholarly journals Laser-Raman Spectrometer

1971 ◽  
Vol 20 (1) ◽  
pp. 28-39 ◽  
Author(s):  
Tsunetake FUJIYAMA ◽  
Mitsuo TASUMI
Keyword(s):  
Raman Spectrometer ◽  
Laser Raman

scholarly journals A low cost laser-raman spectrometer

1998 ◽  
Vol 21 (5) ◽  
pp. 433-438 ◽  
Author(s):  
A K Bandyopadhyay ◽  
Nita Dilawar ◽  
Arun Vijayakumar ◽  
Deepak Varandani ◽  
Dharambir Singh
Keyword(s):  
Low Cost ◽  
Raman Spectrometer ◽  
Laser Raman
Sign in / Sign up

Export Citation Format

Share Document