Atomic and Molecular Physics MCQs Question and Answer in Engineering Physics

The separation between the first stokes and corresponding anti-stokes Iines of the rotational Raman spectrum in terms of the rotational constant B

A vibrational-electronic spectrum of homonuclear binary molecules, involving electronic ground state ε'' and excited ε', exhibits a continuum at $$\overline v $$ cm^-1. If the total energy of the dissociated atoms in the excited state exceeds the total energy of the dissociated atoms in the ground state by E_ex cm^-1, then dissociation energy of the molecule in the ground state is

For a multi-electron atom $$l$$, L and S specify the one electron orbital angular momentum, total orbital angular momentum and total spin angular momentum respectively. The selection rules for electric dipole transition between the two electronic energy levels, specified by $$l$$, L and S are

Two states of an atom have definite parities. An electric dipole transition between these states is

A collection of N atoms is exposed to a strong resonant electromagnetic radiation with N_g atoms in the ground state and N atoms in the excited state, such that N_g + N_e = N. This collection of two-level atoms will have the following population distribution

The last two terms of the electronic configuration of manganese (Mn) atom is 3d⁵ 4s². The term factor of Mn⁴⁺ ion is

Deuteron in its ground state has a total angular momentum J = 1 and a positive parity. The corresponding orbital angular momentum L and spin angular momentum S combinations are

Two monochromatic waves having frequencies $$\omega $$ and $$\omega + \Delta \omega \left( {\Delta \omega \ll \omega } \right)$$    and corresponding wavelengths $$\lambda $$ and $$\lambda - \Delta \lambda \left( {\Delta \lambda \ll \lambda } \right)$$    of same polarization, travelling along X-axis are superimposed on each other. The phase velocity and group velocity of the resultant wave are respectively given by

A pure rotational Raman spectrum of a linear diatomic molecule is recorded using electromagnetic radiation of frequency $${\nu _e}$$ . The frequency of two consecutive Stokes lines are

The rotational partition function for a diatomic molecule of moment of inertia $$I$$ at a temperature T is given by