spectroscopy: the study of squiggly...
TRANSCRIPT
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Spectroscopy: The Study of Squiggly Lines
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Spectroscopy in Curiosity’s site selection
Morphologic Spectral Evidence for water
Mawrth Vallis
Eberswalde Crater
Holden Crater
Gale Crater
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Electron Orbital Transitions
• In the visible/near-infrared, spectra are dominated by transitions between d orbitals in transition metals
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Electron Orbits
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Energy Level Splitting in Solids: Part 1
In a free atom these have equal energy, but not in a crystal…
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Energy Level Splitting in Solids: Part 2
Distortion of some “sites” in a crystal è further energy splitting à diagnostic of mineralogy
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Fe electronic transitions in olivine, pyroxene
Mustard et al. (2005)
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Spectroscopy: linking meteorites to asteroids
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• In the visible/near-infrared, spectra are dominated by transitions between d orbitals in transition metals
• Electrons can also be transferred from one atom to another one nearby
Electron Orbital Transitions
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Electron charge transfer: why Mars is red!
Morris et al. (2000)
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Semiconductor physics
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Band gap transition absorptions
Yellow color of sulfur (e.g., on Io) due to band gap transitions
http://speclab.cr.usgs.gov/PAPERS.refl-mrs/refl4.html
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Molecular vibrations
Symmetric stretch
Asymmetric stretch
Rocking Wagging Twist
Scissor/bend
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Water vibrations: ice vs. hydrated minerals McCord et al. (1998)
A – D are Europa, E is Ganymede, F is model ice spectrum
νstretch
νstretch + νbend
2νstretch
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Europa spectral variations
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Mg, Na-sulfates
Europa’s hydrates: acid or salts? Carlson et al. (2009)
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Hydrated salt spectra
Wray et al. (2011)
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MRO/CRISM
Laboratory bassanite (CaSO4·½H2O)
Hydrated salts on Mars: e.g., bassanite
Wray et al. (2010)
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Spectroscopy-guided roving
Michalski et al. (2010)
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Hansen & McCord (2008)
(and Ganymede, Callisto) Peroxide, CO2 and more on Europa
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Kuiper belt objects: spectrally diverse
Jewitt & Luu (2004)
NH3�H2O
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Organic molecules
Clark et al. (2009)
Identified on Callisto, Ganymede, Iapetus, Phoebe, …
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§ Link amino acids in proteins, with distinct IR signature à biomarker
§ NIR bands ambiguous; stronger fundamental bands at ~6 µm
Amides: Spectral biomarkers?
Dalton et al. (2003)
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Methane on Mars?
Mumma et al. (2009)
Krasnopolsky et al. (2004)
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Methane on Earth – mainly biogenic
Atreya et al. (2007)
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History of CH4 observations
• All based on IR absorption lines near 3.3 or 7.7 µm
• Upper limits 20–50 ppbv from Viking, ground-based pre-2003 (Maguire 1977; Krasnopolsky et al. 1997; Lellouch et al. 2000)
• Mumma et al. ground-based (reported 2003, published 2009): 0–50 ppb range
• Krasnopolsky et al. ground-based (2004): 10 ppb global avg.
• Formisano et al. MEx-PFS (2004): 0–30 ppb range
• Fonti & Marzo TES (2010): 0–70 ppb range
Multiple “detections” only confirm each other if they’re real…
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The challenge of ground-based observing
• Terrestrial CH4 ~1750 ppb, ~104 x Martian abundance!
• Doppler shifts up to 18 km/s è line offsets up to 0.2 nm
Krasnopolsky et al. (2004)
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Mumma et al. (2009) ground-based
• Three lines resolved; no unidentified spectral features è Discovered new CO2 band system (Villanueva et al. 2008)
overlapping lines analyzed by Krasnopolsky and PFS team
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Mumma et al. (2009): seasonal, spatial variations
Other groups claim different localized plumes, or no plumes at all…
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Curiosity’s SAM Tunable Laser Spectrometer
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Curiosity’s SAM Tunable Laser Spectrometer
Can increase CH4 sensitivity by factor ~50–100 via
enrichment
Webster & Mahaffy (2011)