13B.1(a) The line marked A in Fig. 13.3 is the fluorescence spectr benzophenone in solid solution in ethanol at low temperatures observed when the sample is illuminated with 360 nm ultraviolet radiation. What can be said about the vibrational energy levels of the carbonyl group in (i) its ground electronic state and (ii) its excited electronic state? 13B.1(b) When naphthalene is illuminated with 360 nm ultraviolet radiation it does not absorb, but the line marked B in Fig. 13.3 is the phosphorescence spectrum of a solid solution of a mixture of naphthalene and benzophenone in ethanol. Now a component of fluorescence from naphthalene can be detected. Account for this observation. inw B/ s leltnsto nien d d vd Dw gnienisho Adodt ni noV t 15 20 25 Emission intensity

13B.1(a) The line marked A in Fig. 13.3 is the fluorescence spectr benzophenone in solid solution in ethanol at low temperatures observed when the sample is illuminated with 360 nm ultraviolet radiation. What can be said about the vibrational energy levels of the carbonyl group in (i) its ground electronic state and (ii) its excited electronic state? 13B.1(b) When naphthalene is illuminated with 360 nm ultraviolet radiation it does not absorb, but the line marked B in Fig. 13.3 is the phosphorescence spectrum of a solid solution of a mixture of naphthalene and benzophenone in ethanol. Now a component of fluorescence from naphthalene can be detected. Account for this observation. inw B/ s leltnsto nien d d vd Dw gnienisho Adodt ni noV t 15 20 25 Emission intensity

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 13P

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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.

Question

13B.1(a) The line marked A in Fig. 13.3 is the fluorescence spectrum of
benzophenone in solid solution in ethanol at low temperatures observed when
the sample is illuminated with 360 nm ultraviolet radiation. What can be said
about the vibrational energy levels of the carbonyl group in (i) its ground
electronic state and (ii) its excited electronic state?
13B.1(b) When naphthalene is illuminated with 360 nm ultraviolet radiation
it does not absorb, but the line marked B in Fig. 13.3 is the phosphorescence
spectrum of a solid solution of a mixture of naphthalene and benzophenone
in ethanol. Now a component of fluorescence from naphthalene can be
gritsi
nighoo
A
detected. Account for this observation.
20
P11900 cm-1)
15
t uo dintion in a transition
Emission intensity

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