Interpretation:
The reason as to why rotational spectrum cannot be observed for the rotation of a linear molecule about its linear axis is to be stated.
Concept introduction:
An electronic state of energy has its own vibrational states. The energy between the electronic states is large followed by vibrational states and then rotational states. During an electronic transition, electron from ground state moves straight to the excited state keeping the internuclear distance constant. This is known as the Franck-Condon principle.
Answer to Problem 14.1E
The rotational spectrum for the rotation of a linear molecule about its linear axis is not observed because when a linear molecule is rotated along its linear axis, the position of dipole remains unchanged.
Explanation of Solution
The rotational spectrum for a molecule is observed when the rotation of molecule changes the position of dipole. When a linear molecule is rotated along its linear axis, the position of dipole remains unchanged. Therefore, the rotational spectrum is not observed for rotation of a linear molecule.
The rotational spectrum for the rotation of a linear molecule about its linear axis is not observed because when a linear molecule is rotated along its linear axis, the position of dipole remains unchanged.
Want to see more full solutions like this?
Chapter 14 Solutions
Physical Chemistry
- What are the energies and angular momenta of the first five energy levels of benzene in the 2-D rotational motion approximation? Use the mass of the electron and a radius of 1.51A to determine I.arrow_forward22. Momentum of inertia of NO (from measurements of its rotational spectrum) is 1.647x 1046 kg m. A) Calculate the bondlength of NO molecule; B) Calculate the energy necessary to start its rotation.arrow_forwardWhat kind of rotational symmetry is present in a square?arrow_forward
- What can be determined from the pure rotational spectrum of a diatomic molecule? The diatomic bond length The vibrational energy of the diatomic molecule The identities of the two atoms in the diatomic molecule The diatomic bond strength Which of the following transitions is allowed for an electronic transition from a 3s orbital in a hydrogen-like atom? 3s --> 5s 3s --> 5p 3s --> 2s 3s --> 4darrow_forwardConsider the SF6 molecule with SF bond length 1.561nm and the atomic mass of fluorine and is 18.9984mu and of sulphur is 32.065mu. Calculate the minimum energy required to start the rotation of the molecule.arrow_forwardConsider the rotational spectrum of a molecule XY. If the first line in this spectrum is observed at 3.84235 cm, calculate the Internuclear distance In nm for the molecule XY. If the masses of X and Y are 19.92168 kg and 26.56136 kg respectively. 0.2761 nm 0.1356 nm 0.6953 nm 0.1131 nmarrow_forward
- Explain Vibrational spectra of vibrating diatomic molecules. Write the Schrodinger wave equation, energy expression and selection rules. What is the requirement for a molecule to be active in the Infra Red region? Draw energy level diagram of a Harmonic Oscillator. Also explain anharmonicity Qustion 2arrow_forwardWhich one isn’t not rotationally raman active? HCN, HF, Br2, CCL4arrow_forwardFrom the list of molecules below, select those that are classified as "spherical rotors". CgHg, cubane (cubic symmetry) CHC13, chloroform CH₂Cl2, methylene chloride CC14, tetracholomethane C6H6, benzenearrow_forward
- Which rotational quantum numbers (J" > J') could be associated with a Raman S₂ rovibrational line? A) 21 B) 20C)2→3D)2→2E) 24arrow_forwardExplain why the lines in the spectrum for H35Cl and H37Cl give rise to different rotational constants for the two molecules.arrow_forward4. Which of the following arises from π to π* transitions? Select all that apply.arrow_forward
- Physical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,Principles of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage Learning