..., electron probe microanalysis, transmission electron microscopy as well as Raman and laser-induced photoluminescence spectroscopy. The replacement of K-feldspar by albite occurs via coupled dissolution-reprecipitation due to the mobilization of K in exchange for Na and results in the mobilization of minor...

..., especially using time-resolved laser-induced photoluminescence (TRL) spectroscopy and electron paramagnetic resonance (EPR) spectroscopy to characterize the defect structure of natural zircon, are still few in number (cf. Nasdala et al. 2003 ). There is increasing interest in such studies due...

... (IR) spectroscopy, optical absorption spectroscopy, and most importantly laser-induced photoluminescence (PL) spectroscopy. Yellow is the second most common color of natural diamonds. Yellow diamonds occur in a wide range of tones and saturations ( King et al. , 2005 ), and are categorized...

.... Figure 1 shows the laser-induced (λ exc = 473 nm) REE 3+ photoluminescence spectrum of sample M2. This spectrum can be considered typical of spectra of well-crystallized natural zircon. It is dominated by groups of narrow emission bands. In contrast, broad-band yellow and blue emissions (which...

...., and Kagi, H. ( 2005 ) High spatial resolution photoluminescence and Raman spectroscopic measurements of a natural polycrystalline diamond, carbonado. Diamond and Related Materials , 14 , 1950 –1954. Kagi, H., Masuda, A., and Takahashi, K. ( 1991 ) Laser-induced luminescence from natural polycrystal...

... ). Additionally, we performed measurements with the 488.0 nm line of an Ar + -ion laser to identify photoluminescence signals. Fig. 1 Structural fragment of the endmember titanite structure showing planes containing SiO 4 –TiO 6 –SiO 4 –TiO 6 rings (dashed circle) [projection perpendicular to the ( 2...

... spectroscopy were type-IIb diamonds (i.e., measurable boron and low nitrogen). Two natural blue diamonds and two boron-doped HPHT synthetic diamonds were characterized by steady-state and time-resolved laser-induced photoluminescence (PL) spectroscopy. The steady-state PL measurements were performed...

... than the standard diamond. As described in previous reports, carbonado samples emit very intense photoluminescence (PL) because of the presence of radiation-induced lattice defects ( Kagi et al ., 1991 , 1994a , 1994b , 2007 ). Excitation with the 514.5 nm Ar + laser induces PL lines at 504 nm...

... ). For this process to occur, the incident light (for spectroscopy, typically a laser beam) must lie within the absorption band of the defect center ( Fig. 14 ). Excitation using wavelengths outside the defect’s absorption band will not induce photoluminescence from that center, enabling selective excitation...

... environment. Laser excitation during Raman analysis may also induce emission of luminescence in apatite. Luminescence is used here as a generic term describing all kinds of photoluminescence, e.g., fluorescence, luminescence, or phosphorescence (see Gaft et al. 2015 and Waychunas 2014 for further...

... resonance, NIR-Vis-UV absorption, and photoluminescence spectroscopy. The chemical composition is (wt.%, electron microprobe, H 2 O determined by gas chromatography of ignition products): Na 2 O 25.05, Al 2 O 3 32.44, SiO 2 37.58, HS 4.33, Cl 2.22, H 2 O 0.30, –O≡(Cl,HS) –1.55, total 100.37. The empirical...

...-ray topographic analysis with synchrotron radiation ( Liu et al ., 2006 ), laser-induced breakdown spectroscopy (LIBS) ( McMillan et al ., 2006 ), Fourier-transformed infrared (FTIR) and Raman spectroscopies ( Liu & Peng, 2005 ), Vis-NIR absorption ( Laurs et al ., 2003 ; Hawthorne et al...

... spectroscopy techniques, laser excitation, and photon counting detection systems. Further, pulsed and gated spectroscopy techniques are enabling separation of electronic processes as never previously possible, thus opening the door to electronic characterization of natural materials that are heterogeneous...

..., USA Sedimentary agate 1.93–71.99 (33) Numbers in brackets give the number of analytical points The experimental setup for laser-induced time-resolved luminescence measurements consists of three main units: laser excitation source, gated spectrometer and computer for system...

... spectrometry (TOF-SIMS), field emission scanning electron microscopy (FE-SEM), and electron probe microanalysis (EPMA) in an attempt to detect structurally bound OH − in the fluorapatite. Although OH − could not be definitively detected by Raman spectroscopy because of REE-induced photoluminescence, hydroxyl...

... Lakowicz JR ( 2006 ) Principles of Fluorescence Spectroscopy . 3rd Edition . Springer-Verlag US , 954 pp Lenz C and 5 coauthors ( 2015 ) Laser-induced REE 3+ photoluminescence of selected accessory minerals — an “advantageous artefact” in Raman spectroscopy . Chemical Geology...

... took place at H P -H T conditions. Raman and some of the photoluminescence spectra were obtained using a Jobin-Yvon T64000 Raman spectrometer equipped with an Olympus microscope and a CCD camera. An argon laser (514.5 nm) was used for the excitation. Strong luminescence observed in many samples...

... al. (2012) . Here, we briefly address several common issues. A very common artefact in Raman spectroscopy of minerals is the simultaneous excitation of photoluminescence by the incident laser: that is, light emission due to electronic transitions. Such emission lines, especially the relatively narrow...

...Tobias Beirau; Boriana Mihailova; Galina Matveeva; Ute Kolb; Thomas Malcherek; Lee A. Groat; Ulrich Bismayer Abstract The structural state of metamict titanite was studied by Raman spectroscopy, complementary high-resolution transmission electron microscopy, and single-crystal X-ray diffraction...

... of the intensity ratios between N-line and sidebands for quantitative calculations in the case of laser induced PL spectroscopy. F igure 9. N-Lines and sidebands in the spectral range from 696 to 725 nm for synthetic ruby crystals with different Cr concentrations; for quantitative measurements, the N...