Which of the following molecules does not show any pure rotational absorption ba

Question

Which of the following molecules does not show any pure rotational absorption bands? a. CO_2 b. CH-4 c. HCI d. F_2 e. CO 9) Which of the following statements are true regarding the rotational behavior of molecular nitrogen (N_1) a. Nitrogen does not have any rotational energy levels populated because the gross selection rule for rotational transitions states that a molecule must possess a dipole moment. b. Nitrogen has all rotational energy levels populated, but transitions between states cannot be stimulated by photons c. Nitrogen has all rotational energy levels populated and rotational transitions can occur if they satisfy the j=+/-1 selection rule d. Nitrogen only has even-numbered J levels populated but exhibits transitions that follow the j=+/-1 selection rule. e. Nitrogen only has odd-numbered) levels populated but exhibits transitions that follow the J = +/-1 selection rule. 10) The pure rotational spectrum of H^35C1 was measured and it was found that the spacing between each successive peak in the spectrum was 21.2 cm^1. What is the rotational constant beta of H^35CI? a. 10.6 cm^-1 b. 21.2 cm^-1 c. 42.4 cm^-1 d. 3.49x106-21 e. 1.19 x10^-21

Explanation / Answer

8) the pure rotaional spectrum is not observed in case of molecules which do not have any dipole moment

So here the homodiatomic molecule (F2) will not show any pure rotational spectrum

9) N2 will not show any rotational spectrum as it does not have any dipole moment

Answer (a)

10) The value of rotational constant of HCl = 10.6 cm^-1 (half of peak spacing)

11) Here in P-branch the delta J = -1

Which means there is decrease in rotational level (decrease in rotational energy) and increase in vibrational energy

Option c

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