Monterey Bay Aquarium Research Institute
Laser Raman Spectroscopy
Example Spectra

Below are some examples of the spectra we have obtained with DORISS both in the lab and on the seafloor.

Liquids

Seawater

in the lab

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Seawater

25 & 3500 m in the Monterey Bay

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Solids

Polished silicon wafer

in the lab with PUP

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Marble sample

in the lab with PUP

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Shell fragment

1024 m in the Monterey Bay

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Granite sample -- 2 m scan

in the Monterey Bay with PUP

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Granite sample -- 0.2 m scan

in the Monterey Bay with PUP

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Methane-ethane hydrate (sII)

1022 m in the Monterey Bay

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Gases

50%-50% CO2-N2 mixture

300 m in the Monterey Bay

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natural gas (97% methane)

in the Gulf of California

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Note: the calibration of the instrument for the earlier data is not as accurate as for the later data. Also, data obtained at depth in the ocean may show calibration shifts due to temperature and pressure effects. A diamond plate in the beam path in the optical head produces the 1332 cm-1 diamond line that is superimposed on the later data. This provides a calibration reference.

Next:  Gas Hydrates

Last updated: Feb. 05, 2009
Questions? Comments? Please contact Edward Peltzer.