Rotational intensity distribution in theH2photoelectron spectrum

The intensity distributions of rotational lines of the ${\mathrm{H}}_2^{+}$ photoelectron spectrum (Hei) were obtained using a high-resolution photoelectron spectrometer ($\Delta E=13\mathrm{}$ meV) and the deconvolution technique. The ratios of the intensity of the lines for the $(J^{\prime },J^{\prime \prime })=(0,0), \mathrm{}(2,2), \mathrm{and} \mathrm{}(3,3)\mathrm{}$ transitions to the intensity of the line for the $(J^{\prime },J^{\prime \prime })=(1,1)\mathrm{}$ transition were measured as a function of the vibrational quantum numbers ($v^{\prime }$) and found to be almost independent of $v^{\prime }$. It is observed that the ratio of the total intensity of the line with $\Delta J=2\mathrm{}$ to that with (1,1) decreases as $v^{\prime }$ becomes larger in agreement with the theoretical calculation. The rotational constants of the ground state of ${\mathrm{H}}_2^{+}$ obtained in the present experiment agree with previously reported data.