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.
Apiose is one of several naturally occurring carbohydrates characterized by a branched carbon chain and is conveniently isolated as the compound shown (“diacetone apiose”). Based on the observation that the protons at C(1) and C(2) have a coupling constant of 3.7 Hz, choose the correct statement.
(a) The C(1) and C(2) protons are eclipsed.
(b) The H C(1) C(2) H dihedral angle is in the range 30–60°.
(c) The H C(1) C(2) H dihedral angle is in the range 145–165°.
(d) The C(1) and C(2) protons are anti.
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