Tsuji,. Minoru Toyoda and Nobuhiko. Ishibashi. Faculty of Engineering,. Kyushu University,. Hakozaki,. Fukuoka. The emission spectra of o-, m- and p-xylenes.
CHEMISTRY
LETTERS,
pp.
1157-1158,
1972.
Published
by
the
Chemical
Society
of
Nobuhiko
Ishibashi
Japan
EMISSION SPECTRA OF XYLENES BY CONTROLLED ELECTRON IMPACT Teiichiro
Ogawa,
Faculty
of
Engineering,
The
emission
by
exciting
A
characteristic
in
the
270
emission
molecules
were
reported
Those
of In
from
and
xylenes the
parents
molecule give 250
is
as
aromatics.
a
characteristic
450
with
of
the
fluorescence transition
cases
of
which
are
be
in
the
to
assigned
431
and
389
nm to
CH radical.
This of
ence larger
in
in
The
intensity
two than
Fig..
The of
and
the present
o-
the
and
more
of
which
under
the
vibfrom
the
more
The
and
and
anisole
320
large
nm region.1)
latter
The
spectra
the
yield
of
It
can
ground
are
some
o-xylenes
the
latter
concluded
was
to
as
in
2)
that
is
relative differto
the
around
more
a remarkable reported
410, at
is The
the
features,
434,
and
xyof
assigned
bands
p-
shows
each band
state
and
p-xylene be
the
at
fluorescence. series
to
nm region
additional
the
the
similar
320
is
lines and
in
for
it
the
sharp
of
structure in
-
to
Thus,
series
species
is
270 structure
Balmer
Balmer
m-xylene
well
to
freedoms
aromatic
parent
vibrational
there
from
excitation
the
2)
that
more
The
impact
in
state
the
has
large
of
photoemission than
corresponds
species.
observed
m-xylenes.3)
the
easily
excited
spectra
vibrational
fluorescence
on
-
predominant.
spectrum
singlet these
hydrogen
250
excitation done
the
more
structure.
hydrogen
also
over
toluene
excitation,
observed
study
of
been
the
electron
was
fragment
of in
because
different
appearance
is
band
spectra.
V.
impact
has
observed
become
1.
the
In
has
phenomenon
impact
band
to
the
former
aromatic
that
in
excited
nm are
diffuse.
xylenes
lowest
389
difference
300
letter.
was
of
anisole.1)
assigned
-
observed
electron
observed
probably
location
and
The
is
both
397
noteworthy.
this
molecules
shown
in
and
200 was
different
little spectra
was
molecules
intensity
from
observed
and
were
under
electron
processes
observed
toluene
could
large This
spectrum
of
intensity
p-xylene
emission
in
A characteristic
band
the
However,
under
spectra
different The
were
beam
However, of
Fukuoka
p-xylenes
hydrocarbon
band
exceptional
nm region
and
molecules
The
non-radiative
o-xylene.
lene.
simple
spectra
emission
Hakozaki,
aromatic
band
communicated
photoemission.
of
the
researchers.
intense -
the
m-
and
m-xylenes.
many
Typical
that
region. of
Toyoda
electron
the
of
of
o-,
controlled
by
are
one
of
of
themselves.
and
University,
spectra
fragments
motion
Kyushu
band nm
and
emission
small
large
320
o-
investigated
organic
of
of
Minoru
with
structure
those
The
-
Tsuji,
spectra
them
rational
were
Masaharu
be
molecule
1158
Chemistry
with
higher
symmetry This the
is
symmetry in
the
emission
probably
electronic
1)
T.
Ogawa,
2)
I.
S.
because
a sharper
and
spectrum the
stronger
by electron
former
has
band impact
less
than
the
just
vibrational
as
one in
modes
with
the to
1972
less
fluorescence. interact
with
level. M. Tsuji,
Berlman,
Academic
has
Letters,
Press,
3) W. A. Noyes
M. Toyoda
"Handbook Jr.
New York and
D. A.
of
and
N.
Ishibashi,
Fluorescence
Chemistry
Spectra
of
Lett.,
Aromatic
1,
233
(1972).
Molecules"
2nd ed.,
(1971). Harter,
J.
Phys.
Fig.
Chem.,
75,
2741
(1971).
1.
( Received
September
12,
1972
)
