Molecular Spectroscopy Notes | EduRev

: Molecular Spectroscopy Notes | EduRev

 Page 1


Molecular Spectroscopy 
 
Types of transitions: 
1)  Electronic (UV-Vis-Near IR) 
2)  Vibrational (IR) 
3)  Rotational (microwave) 
Page 2


Molecular Spectroscopy 
 
Types of transitions: 
1)  Electronic (UV-Vis-Near IR) 
2)  Vibrational (IR) 
3)  Rotational (microwave) 
Electronic Absorption Spectra 
Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, Prentice 
Hall, Englewood Cliffs, NJ, 1991. 
p ? p* 
Page 3


Molecular Spectroscopy 
 
Types of transitions: 
1)  Electronic (UV-Vis-Near IR) 
2)  Vibrational (IR) 
3)  Rotational (microwave) 
Electronic Absorption Spectra 
Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, Prentice 
Hall, Englewood Cliffs, NJ, 1991. 
p ? p* 
Atomic Orbitals (AO) Combine to give 
Molecular Orbitals (MO) 
Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, 
Prentice Hall, Englewood Cliffs, NJ, 1991. 
Bond Order =  
(# bonding e
-
 - # antibonding e
-
) / 2 
Total Spin Quantum Number (S) 
 
S = Ss
i 
Page 4


Molecular Spectroscopy 
 
Types of transitions: 
1)  Electronic (UV-Vis-Near IR) 
2)  Vibrational (IR) 
3)  Rotational (microwave) 
Electronic Absorption Spectra 
Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, Prentice 
Hall, Englewood Cliffs, NJ, 1991. 
p ? p* 
Atomic Orbitals (AO) Combine to give 
Molecular Orbitals (MO) 
Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, 
Prentice Hall, Englewood Cliffs, NJ, 1991. 
Bond Order =  
(# bonding e
-
 - # antibonding e
-
) / 2 
Total Spin Quantum Number (S) 
 
S = Ss
i 
Are you getting the concept? 
Calculate the bond order for CO 
and predict its stability. 
 
Assuming that the same set of 
molecular orbitals applies, suggest 
a diatomic that would be unstable. 
Page 5


Molecular Spectroscopy 
 
Types of transitions: 
1)  Electronic (UV-Vis-Near IR) 
2)  Vibrational (IR) 
3)  Rotational (microwave) 
Electronic Absorption Spectra 
Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, Prentice 
Hall, Englewood Cliffs, NJ, 1991. 
p ? p* 
Atomic Orbitals (AO) Combine to give 
Molecular Orbitals (MO) 
Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, 
Prentice Hall, Englewood Cliffs, NJ, 1991. 
Bond Order =  
(# bonding e
-
 - # antibonding e
-
) / 2 
Total Spin Quantum Number (S) 
 
S = Ss
i 
Are you getting the concept? 
Calculate the bond order for CO 
and predict its stability. 
 
Assuming that the same set of 
molecular orbitals applies, suggest 
a diatomic that would be unstable. 
Are you getting the concept? 
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