NO is a well-known example of a molecular system in which excited electronic energy levels are readily accessible at room temperature. Both the ground and excited electronic states are doubly degenerate and are separated by 121.1 cm¬1. (Note: the Boltzmann constant k = 1.38 × 10¬4 J.s, speed of the light c = 3.00 · 1010 cm · s-1 the Planck constant h = 6.626 - 10¬34 J.s). Part A Evaluate the electronic partition function for this molecule at 373 K . Express the electronic partition function to three significant figures. ? qE = Submit Request Answer Part B Determine the temperature at which qɛ = 3. Express the temperature in kelvins to three significant figures. ? T = K Submit Request Answer

The number of nodes for the vibrational wavefunction of an excited CO is found to be 5. If the force constant of C--O is 1550 N/m, what is the vibrational energy (in kJ/mol) of the excited CO? (h= 6.626 x 10-¹4J.s) Select one or more: □ A. 78.95 kJ/mol B. 1.34 kJ/mol □ C. 103.34 kJ/mol □ D. 12.9 kJ/mol

Emission of microwave radiation from the J = 10 transition of a molecule has been detected at 88.63 GHz from a region of interstellar space in which there is evidence of thermal equilibrium and a temperature of around 50 K. Estimate the frequency and relative intensity of the J = 2 → 1 transition of the same molecule.

But molecules combine both vibrational and rotational states in such a way that both selection rules must be satisfied if we are only talking about absorption or emission of electromagnetic radiation (i.e. photons). 5 1 images from Krane Ch 9. Relative absorption : 0.330 L=3 to L=2 L=2 to L = 1 Electronic excited state. Electronic ground state L→ L-1 L = 1 to L = 0 Ť 0.340 0.350 SE Energy (eV) 2B 0.360 : hf L=0 L=1 L=2 to to to L = 1 L = 2 L = 3 Photo 4 1 3 1 2 1 1 0 1 1 5 0 4 0 30 20 1 0 0 0 LN L→ L+1 0.370 0.380 no emission here because AL # 0, AL = +1 AN = ±1, HCI spectra. In the middle of the gap is the energy hf that would correspond to a pure vibrational transition, which would violate the rotational selection rule. What is the value of hf for the HCI spectra?