Double resonance spectroscopy of molecular ion beams

Radiofrequency and microwave/infrared double resonance of HD+ in the X2X+ ground state 

An energy level diagram showing the nuclear hyperfine splitting of the 17,1 level is shown in figure 11.47. The most suitable coupling scheme is 

1 respectively). The possible values of the quantum numbers are as follows. 

The matrix elements in the case (b) nuclear spin coupled representation given above, 11), A S, In, G, Id, G2, N, F), are now presented [90]. 

We calculate the dipolar terms giving more of the detail for the proton (equation (11.62)) we have 

Here we have restricted attention to matrix elements diagonal in jj and A, and also put 

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Volume 11/19 brings the spectroscopic data on diamagnetic and paramagnetic molecules as well as on molecular ions up to date considering the publications up to and partly including 1990. The spectroscopic information collected in this volume has been obtained principally from gas phase microwave measurements. In addition, gas phase data have been included derived from methods related to microwave spectroscopy by employing a coherent radiation source. These are molecular beam techniques, radio frequency spectroscopy, electron resonance spectroscopy, laser spectroscopy, and double resonance techniques. Some other methods are considered if the accuracy of the derived molecular parameters is comparable to that of micro-wave spectroscopy and no microwave data are available. Examples would be Fourier infirared spectroscopy or electric deflection method. 

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