1. Physical properties of ices present in TNOs?
Density of nitrogen and methane
Physical properties of ices present in TNOs?
Good afternoon
First of all I want to thank the comité for let me expose our work
The goal of my talk is show you some results of the experiments performed in our laboratory in Alcoi in order to get comments and suggestions for apply in these interesting objects.
With is mind we select 3 molecules. Two of them are detected in TNOs as Nitrogen and CH4. As can be seen from the list of 32 TNOs presented by Barucci, Merlin, Dotto, Doressoundiram and de Bergh.
The third molecule we studied is CO2 because it is detected on the surface of Triton (Cruikshank 93) that can be considered as “relative” of TNOs. Strazzulla (03) And supported by the capture hypothesis for Triton proposed by McKinnon (95) reinforced by the idea of a zone of common origin Morbidelli and Levison (04).
On the other hand the variability in the spectra obtained from the same object in different periods (Barucci et al 05) suggest the possibility of different zones due, among other reasons to differential sublimation (Sedna can have atmosphere in certain conditions).
Then the situation exposed by Quirico et al 99 refering to different terrains with volatile dominated molecules. And the possibility of a CO2 dominated terrain open to us the possibility of study the effect on the characteristic temperature of sublimation of N2 and CH4 due to the structure of CO2.
M.A. Satorre, M. Domingo, R. Luna, C. Millán, J. Cantó
Escola Politècnica Superior d’Alcoi
Universitat Politècnica de València
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2. Density of nitrogen and methane
Contents
Experimental set-up and procedure
Results
n, , pure molecules (N2, CH4, CO2) (Double laser and QCMB)
n for CO2 from ~ 270 to 650 nm (UV-Vis)
Tsubl for pure molecules and CO2 dominated (95 %) binary mixtures (TPD)
Summary
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3. Experimental Set-up and procedure Interference register
Si diodes
(a) chamber squematic side view
(b) chamber squematic top view
CO2
mixture prechamber
CH4 N2
Other
ceravac
center
three
Laser 1
Laser 2 α β
Closed
He-cycle
Cold finger
Au substrat
QCMB
Cryostat
ITR 90
secuvac
turbo
pump
rotary pump
gas inlet window
Interference register
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4. Experimental Set-up and procedure
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5. Double laser technique and Quartz Crystal Microbalance (QCMB)
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6. Density of nitrogen and methane
Results: n, , pure molecules
CH4 (20K)
N2 (20K)
CO2 (77K) 1
Roux, J.A. et al.
ours
Roux, J.A. et al 2
Tempelmeyer, K.E, et al. 3
Warren, S.G.
(g/cm3)
0.42
0.43
0.83
0.85
1.50 n
1.35
1.25
1.45
1.41
1.40
Infrared Optical Properties of Thin film CO, NO, CH4; HCl, N2O, O2, N2, Ar and Air Cryofilms
J.A. Roux; B.E. Wood; A. M. Smith and R.R. Plyer
Roux, J.A.; Wood, B.E.; Smith, A.M.; Plyer, R.R., (1979), Report Nº AEDC-TR-78-81, Defense Technical Information Center.
Tempelmeyer, K.E.; Mills, Jr., D.W., (1968), J. Appl. Phys., 39 (6),
Warren, S.G. (1986), Applied Optics, 25, 16,
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7. Nitrogen Results: n, , nitrogen 04/05/2019
* Roux, J.A.; Wood, B.E.; Smith, A.M.; Plyer, R.R., (1979), Report Nº AEDC-TR-78-81, Defense Technical Information Center.
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8. Methane Results: n, , methane 04/05/2019
* Roux, J.A.; Wood, B.E.; Smith, A.M.; Plyer, R.R., (1979), Report Nº AEDC-TR-78-81, Defense Technical Information Center.
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9. Results: n, , carbon dioxide
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10. Interference with UV-Vis spectrometer
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11. Results: n, carbon dioxide at different 
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12. Density of nitrogen and methane
Results: n, carbon dioxide at different 
Infrared Optical Propertiees of Thin film CO, NO, CH4; HCl, N2O, O2, N2, Ar and Air Cryofilms
J.A. Roux; B.E. Wood; A. M. Smith and R.R. Plyer
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13. Temperature Programmed Desorption with the mass spectrometer
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14. Results: Tsubl
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15. Results: Tsubl, CH4-CO2, N2-CO2 mixtures
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16. Summary
The index of refraction and density of pure Methane, Nitrogen and Carbon Dioxide is obtained at different deposition temperatures
Variation on the index of refraction at wavelengths from 250 till 650 nm are obtained
Changes on the characteristic temperature of sublimation for both methane and nitrogen codeposited with carbon dioxide are identified
Acknowledgements
-This research has been supported by “Ministerio de Ciencia y Tecnología” (AYA ) and FEDER founds
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