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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Cedar GDS361 High Weathered Shake DESCRIPT
DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS361
MATERIAL_TYPE: Wood
MATERIAL: Cedar Shake
FORMULA: Unknown
FORMULA_HTML: Unknown
COLLECTION_LOCALITY: Residential roof in Littleton, Colorado
ORIGINAL_DONOR: Gregg Swayze
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
SAMPLE_DESCRIPTION:
Cedar shake from residential roof, collected in Littleton, Colorado. Shake was exposed to the weather on a roof for about 15 years. Spectrum was measured on the weathered surface of the shake. The spectrum ramps upward nearly monotonically out to 1.4 microns. This ramp is slightly concave with an broad absorption centered at 0.6832 microns. Past 1.4 microns the spectrum has a number of spectral absorptions due to water, cellulose, and lignin. There is a strong asymmetric absorption at 1.4550 microns. A broad complex of absorptions centered at 1.75 microns is probably C-H overtone related. There are other absorptions at 1.92, 2.0975, 2.2703, and 2.3379 microns.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Spectrum was measured on the weathered surface of the shake.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
| LIB_SPECTRA_HED: | where | Wave Range | Av_Rs_Pwr | Comment |
|---|---|---|---|---|
| LIB_SPECTRA: | splib05a r 10518 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 27800 | g.s.= |