But molecules combine both vibrational and rotational states in such a waythat both selection rules must be satisfied if we are only talking aboutabsorption or emission of electromagnetic radiation (i.e. photons).5 1images from Krane Ch 9.Relative absorption:0.330L=3toL=2L=2toL = 1Electronicexcited state.Electronicground stateL→ L-1L = 1toL = 0Ť0.340 0.350SEEnergy (eV)2B0.360:hf L=0 L=1 L=2tototoL = 1L = 2L = 3Photo4 13 12110115 04 030201000LNL→ L+10.370 0.380no emission here because AL # 0,AL = +1AN = ±1,HCI spectra.In the middle of the gap is theenergy hf that would correspondto a pure vibrational transition,which would violate the rotationalselection rule.What is the value of hf for the HCIspectra?

To find out the value of hf from the given HCl spectra.

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What is the value of hf for the HCI spectra?

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter14: Rotational And Vibrational Spectroscopy

Section: Chapter Questions

Problem 14.46E: Determine the number of total degrees of freedom and the number of vibrational degrees of freedom...

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Question

But molecules combine both vibrational and rotational states in such a way
that both selection rules must be satisfied if we are only talking about
absorption or emission of electromagnetic radiation (i.e. photons).
5 1
images from Krane Ch 9.
Relative absorption
:
0.330
L=3
to
L=2
L=2
to
L = 1
Electronic
excited state.
Electronic
ground state
L→ L-1
L = 1
to
L = 0
Ť
0.340 0.350
SE
Energy (eV)
2B
0.360
:
hf L=0 L=1 L=2
to
to
to
L = 1
L = 2
L = 3
Photo
4 1
3 1
2
1
1
0
1
1
5 0
4 0
30
20
1
0
0
0
LN
L→ L+1
0.370 0.380
no emission here because AL # 0,
AL = +1
AN = ±1,
HCI spectra.
In the middle of the gap is the
energy hf that would correspond
to a pure vibrational transition,
which would violate the rotational
selection rule.
What is the value of hf for the HCI
spectra?

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