AI Article Synopsis
- Researchers detected ortho-para mixing interaction in the deuterated vinyl radical H(2)CCD for the first time using millimeter-wave spectroscopy.
- The ground state of H(2)CCD is split by deuteron tunneling into components 0(+) and 0(-), with a separation of approximately 1186.794 MHz.
- The interaction between rotational levels in these states is influenced by nuclear and electron spins, leading to a para to ortho conversion rate constant estimated at 1.2x10^5 s^-1 torr^-1.
Article Abstract
Ortho-para mixing interaction due to the coupling of nuclear and electron spins was detected for the first time by millimeter-wave spectroscopy of the deuterated vinyl radical H(2)CCD. The ground state of H(2)CCD is split by the deuteron tunneling into two components 0(+) and 0(-) separated by DeltaE(0)=1186.794(16) MHz. Rotational levels in the 0(+) and 0(-) states, one being an ortho level and the other a para level, are coupled by the interaction expressed by 0(+/-)mid R:H(')mid R:0(-/+)=(deltaa(F)/2)S(I(1)-I(2)), where I(1) and I(2) are spins of the two protons and S is the electron spin. The deltaa(F) constant has been determined to be 68.06(52) MHz. The para to ortho conversion rate constant is predicted to be 1.2x10(5) s(-1) torr(-1).
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| http://dx.doi.org/10.1063/1.3231491 | DOI Listing |
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