chapt 23A | 暗記メーカー

暗記メーカー

chapt 23A

10問 • 8ヶ月前

問題一覧

1

In electronic absorption spectroscopy, the molar absorptivity (c) is related to the transition dipole moment. Which of the following statements is most accurate regarding an allowed electronic transition?

D. It exhibits a strong absorption peak due to a high transition dipol

2

Why is phosphorescence typically observed at longer timescales compared to fluorescence?

C) Phosphorescence involves intersystem crossing and spin-forbidden transitions

3

In the absorption spectrum of a diatomic molecule, a progression of bands is observed with decreasing intensity at higher energy. What does this imply about the relative positions of potential energy curves for the ground and excited electronic states?

C) The excited state minimum is shifted to longer bond lengths

4

Which of the following factors increases the intensity of Raman scattering for a particular vibrational mode?

C)Strong change in molecular polarizability during vibration

5

Which of the following spectroscopic techniques is most suitable for detecting chiral molecules and determining their absolute configuration?

C) Circular Dichroism (CD) spectroscopy

6

Which of the following transitions is spin- forbidden but can occur due to spin-orbit coupling in heavy atoms?

D. T1→SO

7

The fundamental vibrational frequency of a diatomic molecule is observed at 2200 c m ^ - 1 . If the anharmonicity constant xe is 0.01, what is the position of the first overtone (v = 0 -> 2) transition?

C) 4356cm ^ - 1

8

Which of the following normal modes of vibration in a nonlinear triatomic molecule like H₂O is IR active?

C) All modes with a change in dipole moment

9

Fine structure in atomic spectra arises from * which interaction? Why is fluorescence generally red-shifted compared to the corresponding absorption maximum (i.e., Stokes shift)?

C. Spin-orbit coupling within the atom

10

Why is fluorescence generally red-shifted compared to the corresponding absorption maximum (i.e., Stokes shift?

C) Vibrational relaxation and internal conversion occur before emission

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問題一覧

1

In electronic absorption spectroscopy, the molar absorptivity (c) is related to the transition dipole moment. Which of the following statements is most accurate regarding an allowed electronic transition?

D. It exhibits a strong absorption peak due to a high transition dipol

2

Why is phosphorescence typically observed at longer timescales compared to fluorescence?

C) Phosphorescence involves intersystem crossing and spin-forbidden transitions

3

In the absorption spectrum of a diatomic molecule, a progression of bands is observed with decreasing intensity at higher energy. What does this imply about the relative positions of potential energy curves for the ground and excited electronic states?

C) The excited state minimum is shifted to longer bond lengths

4

Which of the following factors increases the intensity of Raman scattering for a particular vibrational mode?

C)Strong change in molecular polarizability during vibration

5

Which of the following spectroscopic techniques is most suitable for detecting chiral molecules and determining their absolute configuration?

C) Circular Dichroism (CD) spectroscopy

6

Which of the following transitions is spin- forbidden but can occur due to spin-orbit coupling in heavy atoms?

D. T1→SO

7

The fundamental vibrational frequency of a diatomic molecule is observed at 2200 c m ^ - 1 . If the anharmonicity constant xe is 0.01, what is the position of the first overtone (v = 0 -> 2) transition?

C) 4356cm ^ - 1

8

Which of the following normal modes of vibration in a nonlinear triatomic molecule like H₂O is IR active?

C) All modes with a change in dipole moment

9

Fine structure in atomic spectra arises from * which interaction? Why is fluorescence generally red-shifted compared to the corresponding absorption maximum (i.e., Stokes shift)?

C. Spin-orbit coupling within the atom

10

Why is fluorescence generally red-shifted compared to the corresponding absorption maximum (i.e., Stokes shift?

C) Vibrational relaxation and internal conversion occur before emission