At photon energies close to absorption edges in the soft x-ray range, the complex index of refraction, n=1δiβ, of organic materials varies rapidly as a function of photon energy in a manner that strongly depends on the chemical moieties and functionalities present in the material. The authors present details of how these molecular structure specific variations in the complex index of refraction can be utilized to enhance and tune the contrast in reflectivity experiments of organic films. This near edge contrast enhancement mimics the specific contrast achieved through deuterium labeling in neutron reflectivity (NR). This relatively new x-ray approach, resonant soft x-ray reflectivity (RSoXR), thus combines aspects of NR and conventional x-ray reflectivity (XR), yet does not require special chemical procedures. The capabilities of RSoXR are exemplified using a number of polymeric bi- and multilayers. Furthermore, a direct comparison of RSoXR to conventional x-ray reflectivity and NR for polystyrene and poly(methyl methacrylate) bilayers verifies that RSoXR is an excellent alternative tool for the characterization of organic thin films. The influence of the longitudinal and transverse coherence properties as well as the divergence of the x-ray or neutron beam on the capabilities and limitations of each reflectivity variant is discussed.

2.
R.-J.
Roe
,
Methods of X-Ray and Neutron Scattering in Polymer Science
(
Oxford University Press
,
New York
,
2000
).
3.
J.
Genzer
and
R. J.
Composto
,
Polymer
40
,
4223
(
1999
).
4.
X. L.
Zhou
and
S. H.
Chen
,
Phys. Rep.
257
,
223
(
1995
).
5.
D. G.
Bucknall
,
Prog. Mater. Sci.
49
,
713
(
2004
).
7.
S. H.
Anastasiadis
,
T. P.
Russell
,
S. K.
Satija
, and
C. F.
Majkrzak
,
J. Chem. Phys.
92
,
5677
(
1990
).
8.
T. P.
Russell
,
A.
Karim
,
A.
Mansour
, and
G. P.
Felcher
,
Macromolecules
21
,
1890
(
1988
).
9.
C. F.
Majkrzak
,
Acta Phys. Pol. A
96
,
81
(
1999
).
10.
O. H.
Seeck
,
I. D.
Kaendler
,
M.
Tolan
,
M.
Shin
,
M. H.
Rafailovich
,
J.
Sokolov
, and
R.
Kolb
,
Appl. Phys. Lett.
76
,
2713
(
2000
).
11.
C.
Wang
,
T.
Araki
, and
H.
Ade
,
Appl. Phys. Lett.
87
,
214109
(
2005
).
12.
L. G.
Parratt
,
Phys. Rev.
95
,
359
(
1954
).
13.
D. G.
Stearns
,
J. Appl. Phys.
65
,
491
(
1989
).
14.
D.
Ennis
,
H.
Betz
, and
H.
Ade
,
J. Polym. Sci., Part B: Polym. Phys.
44
,
3234
(
2006
).
15.
F. P.
Buff
,
R. A.
Lovett
, and
F. H.
Stillinger
, Jr.
,
Phys. Rev. Lett.
15
,
621
(
1965
).
16.
A. N.
Semenov
,
Macromolecules
27
,
2732
(
1994
).
17.
S. K.
Sinha
,
E. B.
Sirota
,
S.
Garoff
,
H. B.
Stanley
,
Phys. Rev. B
38
,
2297
(
1988
).
18.
M.
Yanagihara
,
T.
Sasaki
,
M.
Furudate
, and
M.
Yamamoto
,
Opt. Rev.
3
,
65
(
1996
).
19.
S. E.
Harton
,
F. A.
Stevie
,
R. J.
Spontak
,
T.
Koga
,
M. H.
Rafailovich
,
J. C.
Sokolov
, and
H.
Ade
,
Polymer
46
,
10173
(
2005
).
20.
A. L. D.
Kilcoyne
, et al.,
J. Synchrotron Radiat.
10
,
125
(
2003
).
21.
J. H.
Underwood
and
E. M.
Gullikson
,
J. Electron Spectrosc. Relat. Phenom.
92
,
265
(
1998
).
22.
O.
Dhez
,
H.
Ade
, and
S.
Urquhart
,
J. Electron Spectrosc. Relat. Phenom.
128
,
85
(
2003
).
23.
S. G.
Urquhart
and
H.
Ade
,
J. Phys. Chem. B
106
,
8531
(
2002
).
24.
E.
G.
Rightor
, et al.,
J. Phys. Chem. B
101
,
1950
(
1997
).
25.
T.
Coffey
,
S. G.
Urquhart
, and
H.
Ade
,
J. Electron Spectrosc. Relat. Phenom.
122
,
65
(
2002
).
26.
D. L.
Windt
,
Comput. Phys.
12
,
360
(
1998
).
27.
J.
Stöhr
,
NEXAFS Spectroscopy
(
Springer
,
New York
,
1992
).
28.
29.
B. L.
Henke
,
E. M.
Gullikson
, and
J. C.
Davis
,
At. Data Nucl. Data Tables
54
,
181
(
1993
).
30.
D.
Attwood
,
Soft X-Rays and Extreme Ultraviolet Radiation, Principles and Applications
(
Cambridge University Press
,
Cambridge, England
,
2000
), pp.
90
94
.
31.
C.
Chang
,
E.
Anderson
,
P.
Naulleau
,
E.
Gullikson
,
K.
Goldberg
, and
D.
Attwood
,
Opt. Lett.
27
,
1028
(
2002
).
32.
H.
Ade
,
A. P.
Smith
,
H.
Zhang
,
G. R.
Zhuang
,
J.
Kirz
,
E.
Rightor
, and
A.
Hitchcock
,
J. Electron Spectrosc. Relat. Phenom.
84
,
53
(
1997
).
33.
S. G.
Urquhart
,
A. P.
Hitchcock
,
A. P.
Smith
,
H. W.
Ade
,
W.
Lidy
,
E. G.
Rightor
, and
G. E.
Mitchell
,
J. Electron Spectrosc. Relat. Phenom.
100
,
119
(
1999
).
34.
K.
Kaznacheyev
,
A.
Osanna
,
C.
Jacobsen
,
O.
Plashkevych
,
O.
Vahtras
, and
H.
Agren
,
J. Phys. Chem. A
106
,
3153
(
2002
).
35.
M.
Sferrazza
,
C.
Xiao
,
R. A. L.
Jones
,
D. G.
Bucknall
,
J.
Webster
, and
J.
Penfold
,
Phys. Rev. Lett.
78
,
3693
(
1997
).
36.
M.
Stamm
and
D. W.
Schubert
,
Annu. Rev. Mater. Sci.
25
,
295
(
1995
).
37.
S. K.
Sinha
,
M.
Tolan
, and
A.
Gibaud
,
Phys. Rev. B
57
,
2740
(
1998
).
38.
M.
Tolan
and
S. K.
Sinha
,
Physica B
248
,
399
(
1998
).
39.
L. K.
Mansur
and
J. R.
Haines
,
J. Nucl. Mater.
356
,
1
(
2006
).
40.
V. A.
Chernov
,
V. I.
Kondratiev
,
N. V.
Kovalenko
,
S. V.
Mytnichenko
, and
K. V.
Zolotarev
,
J. Appl. Phys.
92
,
7593
(
2002
).
41.
A. G.
Richter
,
R.
Guico
,
K.
Shull
, and
J.
Wang
,
Macromolecules
39
,
1545
(
2006
).
42.
W. L.
Ma
,
P. K.
Iyer
,
X.
Gong
,
B.
Liu
,
D.
Moses
,
G. C.
Bazan
, and
A. J.
Heeger
,
Adv. Mater. (Weinheim, Ger.)
17
,
274
(
2005
).
43.
X.
Gong
,
S.
Wang
,
D.
Moses
,
G. C.
Bazan
, and
A. J.
Heeger
,
Adv. Mater. (Weinheim, Ger.)
17
,
2053
(
2005
).
44.
R.
Yang
,
H.
Wu
,
Y.
Cao
, and
G. C.
Bazan
,
J. Am. Chem. Soc.
128
,
14422
(
2006
).
45.
These are similar to the bilayers described in Refs. 40 and 41. A more complete description and analysis of the data, synthesis, and sample construction is in
C.
Wang
,
H.
Ade
,
A.
Hexemer
,
A.
Garcia
,
Q.
Nguyen
,
G.
Bazan
,
K.
Sohn
, and
E.
Kramer
(unpublished).
46.
T. P.
Russell
,
Macromolecules
26
,
5819
(
1993
).
47.
E.
Helfand
and
Y.
Tagami
,
J. Polym. Sci., Polym. Phys. Ed.
9
,
741
(
1971
).
48.
S. E.
Harton
,
F. A.
Stevie
,
Z.
Zhu
, and
H.
Ade
,
J. Phys. Chem. B
110
,
10602
(
2006
).
49.
S. E.
Harton
,
F. A.
Stevie
, and
H.
Ade
,
Macromolecules
39
,
1639
(
2006
).
50.
Y. S.
Seo
,
T.
Koga
,
J.
Sokolov
,
M. H.
Rafailovich
,
M.
Tolan
, and
S.
Sinha
,
Phys. Rev. Lett.
94
,
157802
(
2005
).
51.
H.
Kim
,
A.
Ruhm
,
L. B.
Lurio
,
J. K.
Basu
,
J.
Lal
,
D.
Lumma
,
S. G. J.
Mochrie
and
S. K.
Sinha
,
Phys. Rev. Lett.
90
,
068302
(
2003
).
52.
M. K.
Sanyal
,
S. K.
Sinha
,
K. G.
Huang
, and
B. M.
Ocko
,
Phys. Rev. Lett.
66
,
628
(
1991
).
53.
54.
A. P.
Smith
and
H.
Ade
,
Appl. Phys. Lett.
69
,
3833
(
1996
).
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