Transcript The Optical Spectrum of Thiozone, S3.pptx

The Optical Spectrum of
Thiozone, S3
Damian L. Kokkin
Michael C. McCarthy
Patrick Thaddeus
NASA and NSF
Io and sulfur rich systems
•
Io, the inner most of the Galilean
moons of Jupiter, is known as the
most volcanically active environment
in the solar system.
•
As a result of this activity the
atmosphere and surface of Io are
known to be rich in sulfur containing
molecules; to date diatomic sulfur
(S2), SO and sulfur dioxide (SO2)
detected and mapped in absorption
and emission with a combination of
satellite and ground based
observations2,3,4.
•
S3 and S4 have been proposed to be
responsible for the optical spectrum
observed of Io’s atmosphere with
features in the blue-green region, but
to date no high resolution optical
spectra exist.
Composite image from the robotic Galileo spacecraft that orbited Jupiter
from 1995 to 2003 of Io showing two different volcanic plumes.1
1. NASA/JPL
2. J. R. Spencer, K. L. Jessup, M. A. McGrath, G. E. Ballester, R. Yelle, Science, 288, 1208-1210, 2000
3. A. Moullet, Cfa SMA Science Symposium 2009
4. A. Moullet, E. Lellouch, R. Moreno, M. A. Gurwell and C. Morre, A&A, 482, 279-292, 2008
Past S3
R.I. Billmers and A.L. Smith, J. Phys. Chem. 1991, 95, 4242
B. Meyer, T. Stroyer-Hansen, AND T. V. Oommen, J. MOL. SPEC. 1972, 42, 335
The Experiment
• Discharge 1.5kV and
2.5kOhm.
• 5% H2S in Ne
• Probed via 2C-R2PITOFMS
The Results
S3
S2
Cu
H2S
The Results
h
f
c
e
a
d
b
g
Band Assignment
Band
Wavelength (cm-1)
Δλ (cm-1)
Assignment
a
23052.1527
-
0 00
b
23404.1286
351.9759
1ν1
c
23534.6984
482.5457
1ν2
d
23754.827
702.6743
2ν1
e
23884.4788
832.3261
1ν1+1ν2
f
23998.1869
946.0342
2ν2
g
24101.0161
1048.8634
3ν1
h
24221.8082
1169.6555
ν1 = Symmetric
bend
2ν1+1ν2
ν2 = Symmetric
stretch
The Future
• Measure the mass
selective spectrum of S4
in the green and red
region via a discharge of
S8.
• Perform observations
on Io and other
expected sulfur rich
systems as the Rotten
Egg Nebula
S8 Discharge in Ne
The Future
• Measure the mass
selective spectrum of S4
in the green and red
region via a discharge of
S8.
• Perform observations
on Io and other
expected sulfur rich
systems as the Rotten
Egg Nebula
NASA/ESA & Valentin Bujarrabal (Observatorio Astronomico Nacional, Spain)