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DOI: 10.1063/1.443785

# The Equilibrium Geometry, Potential Function, And Rotation‐vibration Energies Of CH2 In The X̃ 3B1 Ground State

P. Jensen, P. R. Bunker, A. Hoy

Published 1982 · Chemistry

By fitting the eigenvalues of the nonrigid bender Hamiltonian to the 26 available experimental rotation‐vibration energy level splittings of the 3B1 ground electronic state of the methylene radical CH2 we determine the equilibrium geometry and potential function; the data only involve rotational transitions and transitions in the ν2 bending fundamental band. From the fit we determine that the equilibrium bond length is 1.075 A, the equilibrium bond angle is 133.9° and the height of the barrier to linearity is 1878 cm−1. We are able to use the nonrigid bender Hamiltonian, with this potential, to predict all the lower rotation‐vibration energy levels, including the ν1 and ν3 band origins, of CH2 and its isotopes.

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