Separation and Conversion Dynamics of Four Nuclear Spin Isomers of Ethylene

doi:10.1126/science.1120037

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Science 23 December 2005:
Vol. 310. no. 5756, pp. 1938 - 1941
DOI: 10.1126/science.1120037

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Separation and Conversion Dynamics of Four Nuclear Spin Isomers of Ethylene

Zhen-Dong Sun^*, Kojiro Takagi and Fusakazu Matsushima

Department of Physics, University of Toyama, Toyama 930-8555, Japan.

Fig. 1. Recorded differential absorption signal at lock-in time constant of 0.3 s using the 10P44 probe CO₂ laser line at a pressure of 1.44 torr. The trace in the first period is the zero-difference baseline. The trace in the second period shows depletion of 2.46% (±0.20%) for 3 min, and the trace in the third period shows the conversion after the valve is closed. [View Larger Version of this Image (27K GIF file)]

Fig. 2. Recorded differential absorption signals at lock-in time constant of 0.3 s using probe CO₂ laser lines of (A)10R22 at a pressure of 0.98 torr and (B) 10R28 at a pressure of 1.02 torr. The enrichments are 0.91% (±0.05%) and 0.89% (±0.05%) at the end of the second period of (A) and (B), respectively. The spin conversion rates observed in the third periods of (A) and (B) are 7.55 (±0.04) 10^–4 s^–1 and 5 (±5) x 10^–5 s^–1, respectively. [View Larger Version of this Image (29K GIF file)]

Fig. 3. Observed conversion rates as a function of pressure for probing (A) the B_2u species by the 10P10 line and (B) the B_3u species by the 10P26 line of probe CO₂ laser. [View Larger Version of this Image (15K GIF file)]