Summary	Vacuum Ultra Violet photodissociation of CO₂. Bending and energizing the molecule enough dissociate 2O.
Owner	Shannon A. Fiume
Status	CLOSED

Description

Photons in Vacuum Ultra Violet spectrum are able to deposit high enough energy to bend carbon from CO₂ and or allow oxygen to roam among molecule for ease of dissociation. VUV experiment relies on second VUV pulse to further ionize carbon giving more time to allow atoms to separate, UC. Davis.

Background

Evidence for direct molecular oxygen production in CO₂ photodissociation (VUV)

http://science.sciencemag.org/content/346/6205/61.full

C.Y. Ng

UC Davis

5% yield from dual pulsed Vacuum Ultra Violet light 101.5nm - 107.2 range to ionize to specific oxygen resonate states in CO₂. CO2 energized to "roam" to COO and bend before ionization and dissociation to C + O₂.

Partial table of known Dissociation Pathways

Formula	Datum	Paper	References
CO₂(¹∑_g⁺) → CO(¹∑⁺) + O⁺(¹D)	131 nm	Albert SoIow and Yuan T. Lee J. Chem. Phys. 98 (3), 1 February 1993	T. G. Slanger and G. Black, J. Chem. Phys. 54, 1889 (1971); 68, 1844 (1978).
CO₂(¹∑_g⁺) → CO(¹∑⁺) + O⁺(³P)	147 nm		T. G. Slanger and G. Black, J. Chem. Phys. 54, 1889 (1971); 68, 1844 (1978).
O(¹D) + CO₂(¹∑_g⁺) → CO₂(¹∑_g⁺) + O(³P)			J. C. Tully, J. Chem. Phys. 61, 61 (1974); 62, 1893 (1975).
CO₂⁺ → CO(¹∑⁺) + O⁺(⁴S)			J.H.D. Eland, Int. J. Mass Spectrom. Ion Phys., 9 (1972) 397.
CO₂⁺ → CO⁺(²∑⁺) + O⁺(³P)			J.H.D. Eland, Int. J. Mass Spectrom. Ion Phys., 9 (1972) 397.
CO₂ X ²∏_g	13.778 eV		L.S. Wang, J.E. Reutt, Y.T. Lee and D.A. Shirley, J. Electron Spectry. 47 (1988) 16 https://doi.org/10.1016/0368-2048(88)85010-2
CO₂ A ²∏_u	17.314 eV		https://doi.org/10.1016/0368-2048(88)85010-2
CO₂ B ²∑_u⁺	18.077 eV		https://doi.org/10.1016/0368-2048(88)85010-2
CO₂ C ²∑_g⁺	19.394 ev		https://doi.org/10.1016/0368-2048(88)85010-2
CO₂⁺ X ²∏_g	ve (cm^_-1)= 1264(1), null,1470(1) spin-orbit (cm^_-1)= 158(4)		https://doi.org/10.1016/0368-2048(88)85010-2
CO₂⁺ A ²∏_u	ve (cm^_-1)= 1126(3), 459(8), null, spin-orbit (cm^_-1)= 96(8)		https://doi.org/10.1016/0368-2048(88)85010-2
CO₂⁺ B ²∑_u⁺	ve (cm^_-1)= 1275(1), 557(4), 1840(5), spin-orbit (cm^_-1)= null		https://doi.org/10.1016/0368-2048(88)85010-2
CO₂⁺ C ²∑_g^{+ (vibrational energies corrected for fermi resonance)}	ve (cm^_-1)= 1353(4), 614(4), 1567(4), spin-orbit (cm^_-1)= null		https://doi.org/10.1016/0368-2048(88)85010-2

Next Steps

Although laser pathways to dissociation are technically possible, the laser is a constraint as it's only a single point source for dissociation. The photoionization does yield exact energies to vibrate the molecules to specific energies such that dissociation consumes less energy.

Experiments

Theories

Results

Vacuum Ultra Violet light (101.5, 107.2 nm) and other wavelengths involved in related studies should be considered for further research investigation in other dissociation experiments. VUV wavelengths and other data will be further investigated under Chemical Dissociation Meta Analysis studies project.

Photoionization

VUV Photoionization

Analytics