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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: melting_snow mSnw1-16 DESCRIPT
DOCUMENTATION_FORMAT: VOLATILE
SAMPLE_ID: mSnw1a, mSnw3, mSnw4, mSnw5, mSnw8, mSnw9, mSnw12, mSnw14, mSnw15, mSnw16
MATERIAL_TYPE: Oxide
MATERIAL: Water_Ice (snow)
FORMULA: H2O
FORMULA_HTML: H2O
COLLECTION_LOCALITY: Genesse area, Colorado
COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)
DATUM: Not Available # coordinate datum
ORIGINAL_DONOR: Trude King
CURRENT_SAMPLE_LOCATION: Not Available
ULTIMATE_SAMPLE_LOCATION: Not Available
SAMPLE_DESCRIPTION:
This sample of fresh Colorado snow was collected in an ice chest an brought into the laboratory where is slowly melted over a period of a couple of hours. The initial snow depth was approximately 30 cm (1 foot). The sequence shows the changed in the ice/water mix. From the pure white color of the snow, and the fact that the melted residual was very clear, we estimate that the snow had less than 1 ppm particulate contamination. Spectrum at mSnw16 had a puddle of approximately 3 cm of water on top of the snow (2-way optical path ~ 6cm). The sample was discarded after the spectral measurements were complete.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
none
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
No additional compositional details available.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
not available
END_MICROSCOPIC_EXAMINATION.
IMAGE_OF_SAMPLE: Not Available
SPECTROSCOPIC_DISCUSSION:
Classic water absorptions, both frozen and liquid are seen in these spectra. Because of water vapor rising from the sample and changing rapidly with time, small segments of the 1.4, 1.9 and > 2.3 micron region have been deleted, as the data were not corrected for the atmospheric interference. No other materials are indicated in these spectra, so the spectral purity in this region is an a.
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 9224 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9247 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9271 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9296 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9366 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9412 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9457 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9480 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9504 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 9551 | 0.2-3.0µm | 200 | g.s.= |
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