We present a new experimental setup for performing X-ray Absorption Spectroscopy (XAS) in the soft X-ray range at ambient pressure. The ambient pressure XAS setup is fully compatible with the ultra high vacuum environment of a synchrotron radiation spectroscopy beamline end station by means of ultrathin Si3N4 membranes acting as windows for the X-ray beam and seal of the atmospheric sample environment. The XAS detection is performed in total electron yield (TEY) mode by probing the drain current from the sample with a picoammeter. The high signal/noise ratio achievable in the TEY mode, combined with a continuous scanning of the X-ray energies, makes it possible recording XAS spectra in a few seconds. The first results show the performance of this setup to record fast XAS spectra from sample surfaces exposed at atmospheric pressure, even in the case of highly insulating samples. The use of a permanent magnet inside the reaction cell enables the measurement of X-ray magnetic circular dichroism at ambient pressure.

1.
J. R.
Morris
,
J. N.
Russell
, Jr.
, and
C. J.
Karwacki
,
J. Phys. Chem. Lett.
6
,
4923
4926
(
2015
).
2.
J.
Dou
,
Z.
Sun
,
A. A.
Opalade
,
N.
Wang
,
W.
Fu
, and
F.
Tao
,
Chem. Soc. Rev.
46
,
2001
2027
(
2017
).
3.
M.
Salmeron
and
R.
Scholgl
,
Surf. Sci. Rep.
63
,
169
199
(
2008
).
4.
D.
Pierucci
,
J. J.
Gallet
,
F.
Bournel
 et al,
J. Phys. Chem. C
120
,
21631
(
2016
).
5.
A.
Knop-Gericke
,
M.
Havecker
,
T.
Neisius
, and
Th.
Schedel-Niedrig
,
Nucl. Instrum. Methods Phys. Res., Sect. A
406
,
311
322
(
1998
).
6.
M.
Havecker
,
A.
Knop-Gericke
, and
T.
Schedel-Niedrig
,
Angew. Chem., Int. Ed.
37
,
1939
(
1998
).
7.
P. T.
Kristiansen
,
T. R. C.
Rocha
,
A.
Knop-Gericke
,
J. H.
Guo
, and
L. C.
Duda
,
Rev. Sci. Instrum.
84
,
113107
(
2013
).
8.
Y.
Tamenori
,
J. Synchrotron Radiat.
20
,
419
425
(
2013
).
9.
J.
Forsberg
,
L. C.
Duda
,
A.
Olsson
 et al,
Rev. Sci. Instrum.
78
,
083110
(
2007
).
10.
C.
Escudero
,
P.
Jiang
,
E.
Pach
 et al,
J. Synchrotron Radiat.
20
,
504
508
(
2013
).
11.
J. J.
Velasco-Velez
,
C. H.
Wu
,
B. Y.
Wang
,
Y.
Sun
,
Y.
Zhang
,
J.-H.
Guo
, and
M.
Salmeron
,
J. Phys. Chem. C
118
,
25456
25459
(
2014
).
12.
C.
Lamberti
,
C.
Prestipino
,
F.
Bonino
 et al,
Angew. Chem., Int. Ed.
41
,
2341
2344
(
2002
).
13.
S.
Bordiga
,
E.
Groppo
,
G.
Agostini
,
J. A.
van Bokhoven
, and
C.
Lamberti
,
Chem. Rev.
113
,
1736
1850
(
2013
).
14.
G.
Panaccione
,
I.
Vobornik
,
J.
Fujii
 et al,
Rev. Sci. Instrum.
80
,
043105
(
2009
).
15.
IDEX Health & Science, LLC., 619 Oak Street, Oak Harbor, WA 98277, USA.
16.
See www.siad.com for information about lightcyl SIAD gas bottles.
17.
See www.tek.com/keithley for information about Keithley 6514 picoammeter.
18.
See www.ni.com for information about LABVIEW program.
19.
J. S.
Townsend
,
The Theory of Ionisation of Gases by Collision
(
London Constable and Company
,
1910
).
20.
T.
Skala
,
N.
Tsud
,
M. A.
Orti
,
T. O.
Mentes
,
A.
Locatelli
,
K. C.
Prince
, and
V.
Matolin
,
Phys. Chem. Chem. Phys.
13
,
7083
7089
(
2011
).
21.
J.
Stöhr
,
NEXAFS Spectroscopy
(
Springer
,
Heidelberg
,
1992
).
22.
P.
Kuiper
,
B. G.
Searle
,
L. C.
Duda
,
R. M.
Wolf
, and
P. J.
van der Zaag
,
J. Electron Spectrosc. Relat. Phenom.
86
,
107
113
(
1997
).
23.
D. J.
Huang
,
C. F.
Chang
,
H. T.
Jeng
 et al,
Phys. Rev. Lett.
93
,
077204
(
2004
).
24.
S.
Brice-Profeta
,
M. A.
Arrio
,
E.
Tronc
 et al,
J. Magn. Magn. Mater.
288
,
354
365
(
2005
).
25.
J.
Stöhr
and
H. C.
Siegmann
,
Magnetism: From Fundamentals to Nanoscale Dynamics
(
Springer-Verlag
,
Berlin
,
2006
).
You do not currently have access to this content.