The rotational and vibrational spectra of molecules are studied in their ground electronic state. Electronic spectra arise from transitions between different electronic states of the molecule. Correct?
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The rotational and vibrational spectra of molecules are studied in their ground electronic state. Electronic spectra arise from transitions between different electronic states of the molecule. Correct?
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- Which of the following statements about vibrational frequencies are true? (There is more than one correct answer.) Choice 1 of 3:A. A vibrational frequency corresponds to an internal movement of a molecule, such as a bond lengthening and shortening. Choice 2 of 3:B. An imaginary frequency corresponds to a molecular movement downhill from a saddle point. Choice 3 of 3:C. All molecular structures have at least one imaginary frequency.Riboflavin absorbs UV-visible light making the electrons in the molecule more energetic. As a result, the more energetic electrons move from the 'ground state' electronic energy level to higher electronic energy levels known as 'excited states’. Which of the following statements is NOT true regarding how the ‘excited state’ molecule loses energy and returns to the 'ground state'? a) non-radiative losses via bond vibration and rotation within the molecule b) non-radiative losses via phosphorescence c) non-radiative losses via collisions with other molecules d) radiative losses via fluorescence emission of lightDo you expect the fundamental vibrational frequency to be higher for HCl or NaCl? Explain.
- Explain Vibrational spectra of vibrating diatomic molecules7. Consider the Jablonski diagrams below, where So, S₁, and S2 are all singlet electronic states, and T₁ is a triplet electronic state. (So is the electronic ground state.) The horizontal lines indicate the vibrational energy levels in each electronic state. The arrow drawn on the diagram represents the absorption of a UV photon with = 250 nm, promoting the molecule to a high vibrational level in the S₁ state. (The wavelength values here and below are meant as a guide, but this is not really a quantitative question.) Two different processes are described below the diagrams. Read each one, and then draw an appropriate set of arrows on the corresponding diagram to represent the process described. E Diagram #1 - Fluorescence process S₂ S₁ So SS5 T₁ Vo V4 V3 55555 V₂ V₁ V₁ Diagram #2 - Phosphorescence process E S₂ S₁ So 55555 Vo T₁ 7.1 Diagram #1: After the absorption shown in the diagram, the molecule fluoresces, emitting a photon with = 310 nm. ラララララ 7.2 Diagram #2: After the absorption…1
- Calculate the number of possible vibrational modes for each of the following molecules and assign frequency ranges to each. i) NH3 ii) C2H4 iii) CCl2F2 iv) CH3CH2OH b) Which of the above molecules will absorb IR radiations most strongly? Explain your answer.In molecules, microwave spectra and IR or Raman spectra are used to study the levels of rotation and vibration in the fundamental (most stable) electronic state more easily and accurately. Is this correct?Beta-carotene is an organic compound with an orange color. The diagram above shows the ultraviolet spectrum of beta-carotene. Which of the following statements is true about the absorption bands in the spectrum?(see attached image) a.) The absorption band between 250250 and 320 nm320 nm is due to transitions in electronic energy levels, and the absorption band between 380 and 520 nm is due to transitions in molecular vibrational levels. b.) The absorption band between 250 and 320 nm is due to transitions in molecular vibrational levels, and the absorption band between 380 and 520 nm is due to transitions in molecular rotational levels. c.) The two main absorption bands are associated with transitions in electronic energy levels. The band in the region corresponding to shorter wavelengths shows a lower absorbance than the band in the region corresponding to longer wavelengths. d.) The two main absorption bands are associated with transitions in molecular vibrational levels.…
