HW 10-luminescence spectroscopy key

HW 10-luminescence spectroscopy key -...

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Unformatted text preview: HW:
Luminescence
Spectroscopy
 (1)  Explain
the
difference
between
a
fluorescence
emission
spectrum
and
a
fl[email protected] [email protected]spectrum?
 The
emission
spectrum
is
a
measure
of
the
light
emiFed
by
an
atom,
molecule,[email protected] [email protected]([email protected]@on
spectrum.)
The
emission
spectrum
is
 stokes
shiJed
(or
red
shiJed)[email protected] (2)
Define
the
following:
 a)  Phosphorescence:[email protected]@on
of
a
triplet
state
to
the
ground
state.
 b)  Triplet
state:[email protected]=
3
 c)  [email protected]@on:[email protected][email protected] [email protected] d)  Intersystem
crossing:[email protected]tate
to
a
triplet
excited
 state.
 e)  Quantum
yield:[email protected]/number
absorbed
 (3)
Why
is
fl[email protected]@on
spectroscopy?
 In
fl[email protected]signal
over
a
small
background.
Absorbance
 spectroscopy
measures
a
small
decrease
in
a
large
signal.

 (4)
Why
do
some
compounds
fluoresce
but
others
do
not?
 Molecules
will
not
fl[email protected]f
the
decay
([email protected] [email protected]ground
state)
of
the
excited
state
are
faster
than
the
 [email protected]@[email protected],
in
 which
molecules
transfer
energy
to
the
solvent
via
[email protected] [email protected]floppier
molecules
undergo
internal
conversion.
 ...
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This note was uploaded on 11/16/2011 for the course CHEM 4011 at Colorado.

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