Homonuclear diatomic molecules do not absorb infrared radiation but their vibrational spectra are readily obtained using Raman spectroscopy, as shown for H2, N2 and O2 in the Connection to Instrumental Analysis in Chapter 3. The measured vibrational frequencies for the second period diatomic molecules are: 7Li2 (351 cm-1); 11B-(1051 cm-1); 12C2 (1855 cm-1); 14N2 (2358 cm-1); 16O2 (1580 cm-1); 19F2 (919 cm-1).Calculate the force constants for each molecule, using the vibrational frequencies given and the atomic masses for the appropriate isotope provided in Table 19.1.
Electronic Transitions and Spectroscopy
The term “electronic” connotes electron, and the term “transition” implies transformation. In a molecule, the electrons move from a lower to a higher energy state due to excitation. The two energy states, the ground state and the excited state are the lowest and the highest energy states, respectively. An energy change is observed with this transition, which depicts the various data related to the molecule.
Photoelectron Spectroscopy
Photoelectron spectroscopy (PES) is a part of experimental chemistry. It is a technique used in laboratories that involves projecting intense beams of radiation on a sample element. In response, the element ejects electrons for which the relative energies are measured.
Homonuclear diatomic molecules do not absorb infrared radiation but their vibrational spectra are readily obtained using Raman spectroscopy, as shown for H2, N2 and O2 in the Connection to Instrumental Analysis in Chapter 3. The measured vibrational frequencies for the second period diatomic molecules are: 7Li2 (351 cm-1); 11B-(1051 cm-1); 12C2 (1855 cm-1); 14N2 (2358 cm-1); 16O2 (1580 cm-1); 19F2 (919 cm-1).Calculate the force constants for each molecule, using the vibrational frequencies given and the atomic masses for the appropriate isotope provided in Table 19.1.
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