11.3 Rotational lines in the microwave spectrum of 1271³5Cl are observed at 6.8291, 13.6582, 20.4872, and 20.3163 MHz. (a) Assign the transitions. (b) By plotting a graph, determine the value of the rotational constant. (c) Hence calculate the bond length in 1271³5Cl.
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.
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![Concept Introduction:
Rotational constant of a molecule can be
determined using the given formula.
Rotational constant, B =
where,
I = moment of inertia
Moment of inertia of diatomic molecules is given by,
Moment of inertia, I = µR²
where, μ =
ħ
4πTI
MAMB
(mA+MB)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9dc1800e-879a-4445-b827-bea07627c935%2Faec6728a-f999-4c2b-82ef-37332cd03179%2Frt2kxza_processed.jpeg&w=3840&q=75)
![11.3 Rotational lines in the microwave spectrum of 1271³5Cl
are observed at 6.8291, 13.6582, 20.4872, and 20.3163 MHz.
(a) Assign the transitions. (b) By plotting a graph, determine
the value of the rotational constant. (c) Hence calculate the
bond length in 1271³5Cl.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9dc1800e-879a-4445-b827-bea07627c935%2Faec6728a-f999-4c2b-82ef-37332cd03179%2F7i2iglk_processed.jpeg&w=3840&q=75)
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