CO adsorption on Pd(111) and Pd(100): Low and high pressure correlations

1993 ◽  
Vol 11 (4) ◽  
pp. 1969-1974 ◽  
Author(s):  
János Szanyi ◽  
W. Kevin Kuhn ◽  
D. Wayne Goodman
Keyword(s):  
High Pressure ◽  
Co Adsorption

High-Pressure CO Adsorption on Cu-Based Catalysts: Zn-Induced Formation of Strongly Bound CO Monitored by ATR-IR Spectroscopy

Langmuir ◽  
2011 ◽  
Vol 27 (8) ◽  
pp. 4728-4733 ◽  
Author(s):  
Zhimin Liu ◽  
André Rittermeier ◽  
Michael Becker ◽  
Kevin Kähler ◽  
Elke Löffler ◽  
...  
Keyword(s):  
High Pressure ◽  
Ir Spectroscopy ◽  
Co Adsorption

CO Adsorption on Pd–Au Alloy Surface: Reversible Adsorption Site Switching Induced by High-Pressure CO

2015 ◽  
Vol 120 (1) ◽  
pp. 416-421 ◽  
Author(s):  
Ryo Toyoshima ◽  
Nana Hiramatsu ◽  
Masaaki Yoshida ◽  
Kenta Amemiya ◽  
Kazuhiko Mase ◽  
...  
Keyword(s):  
High Pressure ◽  
Co Adsorption ◽  
Adsorption Site ◽  
Alloy Surface ◽  
Reversible Adsorption

Complex model catalysts under UHV and high pressure conditions: CO adsorption and oxidation on alumina-supported Pd particles

2000 ◽  
Vol 162 (1-2) ◽  
pp. 51-66 ◽  
Author(s):  
T Dellwig ◽  
J Hartmann ◽  
J Libuda ◽  
I Meusel ◽  
G Rupprechter ◽  
...  
Keyword(s):  
High Pressure ◽  
Co Adsorption ◽  
Complex Model ◽  
Model Catalysts ◽  
Supported Pd

Extending UHV studies to the mbar range: vibrational SFG spectroscopy of high-pressure CO adsorption on Pt(111) and Pd(111)

Vacuum ◽  
2003 ◽  
Vol 71 (1-2) ◽  
pp. 83-87 ◽  
Author(s):  
Günther Rupprechter ◽  
Holger Unterhalt ◽  
Matthias Morkel ◽  
Paolo Galletto ◽  
Thilo Dellwig ◽  
...  
Keyword(s):  
High Pressure ◽  
Co Adsorption

High-Pressure Studies of CO Adsorption on Pd(111) by X-ray Photoelectron Spectroscopy and Sum-Frequency Generation

2003 ◽  
Vol 107 (15) ◽  
pp. 3522-3527 ◽  
Author(s):  
Vasiliy V. Kaichev ◽  
Igor P. Prosvirin ◽  
Valerii I. Bukhtiyarov ◽  
Holger Unterhalt ◽  
Günther Rupprechter ◽  
...  
Keyword(s):  
High Pressure ◽  
Photoelectron Spectroscopy ◽  
Co Adsorption ◽  
Sum Frequency Generation ◽  
X Ray ◽  
Sum Frequency ◽  
High Pressure Studies ◽  
Frequency Generation

A Newly Designed Infrared Reflection Absorption Spectroscopy System for In Situ Characterization from Ultrahigh Vacuum to Ambient Pressure

2017 ◽  
Vol 72 (1) ◽  
pp. 122-128 ◽  
Author(s):  
Yunshu Du ◽  
Ling Li ◽  
Xuan Wang ◽  
Hengshan Qiu
Keyword(s):  
High Pressure ◽  
Absorption Spectroscopy ◽  
Ambient Pressure ◽  
Co Adsorption ◽  
Ultrahigh Vacuum ◽  
Variable Pressure ◽  
Polarization Modulation ◽  
Infrared Reflection Absorption Spectroscopy ◽  
Infrared Reflection

We present a novel ultrahigh vacuum (UHV) compatible polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) system that is designed for in situ surface spectroscopic characterization on a transferable single crystalline sample. The innovative design of manipulator rod and high-pressure cell (HPC) ensures free movement of the sample between the preparation chamber and the HPC, and perfect separation of them during high pressure experiments. The pressure in the HPC can be varied from UHV (10−9 mbar) to ambient pressure (1000 mbar) while keeping the preparation chamber under UHV conditions. The design of the transferable sample holder and receiving stage allows precise temperature measurement and allows convenient sample changing. In situ IRRAS measurements under variable pressure and temperature can be conducted either in the conventional mode or with polarization modulation. Other surface characterization methods can also use the preparation chamber; thus, the system is endowed with the capability for systematic investigations of surface catalytic reactions. A case study of CO adsorption and oxidation on Pt(111) demonstrates the performance of the system.

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

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