Rotational spectral lines are examined in the HD (hydrogen-deuterium) molecule. If the internuclear distance is 0.075 nm, the wavelength of radiation arising from the transition between the lowest levels is: (mH = 1.67 × 10-27 kg)

The bond dissociation energy of the OH molecule is 4.18 eV with a rotational constant of 18.8 cm-1. For rotationally induced dissociation, the minimum value of the rotational quantum number J is closest to:

Consider an emission line of wavelength λ = 550 nm of Argon (A = 40, Z = 18) at a temperature of 400 K. The full Doppler width of the emission line will be closest to: