Proper understanding of down-shifted Raman spectra of natural graphite: Direct estimation of laser-induced rise in sample temperature

Details Proper understanding of down-shifted Raman spectra of natural graphite: Direct estimation of laser-induced rise in sample temperature Proper understanding of down-shifted Raman spectra of natural graphite: Direct estimation of laser-induced rise in sample temperature

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3527k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 16, pp.3527-3530

Physics

12

Scientific paper

Laser-induced heating during micro-Raman spectroscopy, in some cases, gives rise to considerable down-shifts in Raman spectra of powder graphite samples. Employing the most typical experimental condition for graphitic matter of geochemical and/or cosmochemical interest, 10 mW laser power at the sample surface and ~2 m laser beam, powdered artificial graphite samples revealed the E 2 g mode in low Raman peak position ranging from 1567 to 1576 cm -1 . The energy range agrees very well with the previously reported frequency range for anomalously down-shifted Raman spectra of natural graphites. In order to extract spectroscopic information inherent in samples from the E 2 g frequency, it is essential to remove the laser-induced down-shift and to know the temperature of sample surface. We showed that the intensity ratio of the Stokes line to the anti-Stokes line for the E 2 g Raman band of graphite is potential to monitor the temperature of graphite surface. Furthermore, our measurement employing enough low laser power without laser-heating showed that natural graphite sample containing the rhombohedral polymorph exhibited the same G-band frequency as the E 2 g (1582 cm -1 ) frequency of hexagonal graphite. Thus, stacking sequences of graphite did not affect the intralayer vibrational energy.

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