Photoelectron spectroscopy under ambient pressure and temperature conditions

Ogletree, D. Frank; Bluhm, Hendrik; Hebenstreit, Eleonore D.; Salmerón, Miquel

doi:10.1016/j.nima.2008.12.155

Cited by 238 publications

(225 citation statements)

References 56 publications

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“…20,21 Our data demonstrate that molecular oxygen does not have a strong interaction with Au surfaces at room temperature. However, we observed that molecular oxygen can be activated on both types of samples by Xray irradiation to produce oxidic Au.…”

mentioning

confidence: 73%

Room-Temperature Reaction of Oxygen with Gold: An In situ Ambient-Pressure X-ray Photoelectron Spectroscopy Investigation

et al. 2010

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confidence: 73%

Room-Temperature Reaction of Oxygen with Gold: An In situ Ambient-Pressure X-ray Photoelectron Spectroscopy Investigation

et al. 2010

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“…Liquid-jet experiments were performed at the Molecular Environmental Sciences beamline (11.0.2) at the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory (LBNL) (48)(49)(50)(51)(52). The details of the experimental setup and procedures have been described previously (21).…”

Section: Methodsmentioning

confidence: 99%

Specific cation effects at aqueous solution−vapor interfaces: Surfactant-like behavior of Li ⁺ revealed by experiments and simulations

Perrine

Parry

Stern

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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It is now well established by numerous experimental and computational studies that the adsorption propensities of inorganic anions conform to the Hofmeister series. The adsorption propensities of inorganic cations, such as the alkali metal cations, have received relatively little attention. Here we use a combination of liquid-jet X-ray photoelectron experiments and molecular dynamics simulations to investigate the behavior of K + and Li + ions near the interfaces of their aqueous solutions with halide ions. Both the experiments and the simulations show that Li + adsorbs to the aqueous solution−vapor interface, while K + does not. Thus, we provide experimental validation of the "surfactant-like" behavior of Li + predicted by previous simulation studies. Furthermore, we use our simulations to trace the difference in the adsorption of K + and Li + ions to a difference in the resilience of their hydration shells.ion adsorption | air−water interface | specific ion effects | Hofmeister series | aqueous ionic solvation M yriad chemical and biochemical processes that occur in aqueous salt solutions exhibit trends that depend systematically on the identities of the salt ions. These trends, which are commonly referred to as specific ion effects, generally follow the Hofmeister series, a ranking of the ability of salt ions to precipitate proteins that was developed by Franz Hofmeister (1) in the late 1800s. The Hofmeister series applies, however, to a wide range of other seemingly unrelated phenomena, such as colloidal stability, critical micelle concentrations, chromatographic selectivity, protein denaturation temperatures, and the interfacial properties of aqueous salt solutions (2, 3). Early attempts to explain the Hofmeister series relied on the notion that salt ions have a long-range effect on the structure of water, with ions on one side of the series acting as "structure makers" and ions on the other side as "structure breakers" (2, 4). However, more recently, several experimental and computational studies have questioned the role of long-range ordering/disordering effects (4-9), and have provided compelling evidence that ion-specific behavior at aqueous interfaces must be taken into consideration when attempting to explain Hofmeister effects (7, 10-13).Specific anion effects on the interfacial properties of aqueous salt solutions, such as surface tensions and surface potentials, closely follow the Hofmeister series for anions (14). For example, surface tension increments (STIs; differences between the surface tension of a salt solution and that of neat water) of sodium salts at the same concentration decrease in the order: SO 4 2− > Cl − > Br − > NO 3 − > I − (15, 16). Molecular dynamics (MD) simulations have predicted that the propensity of anions to adsorb to the solution-vapor interface follows the Hofmeister series in reverse (7,14,17), and this prediction has largely been confirmed experimentally (14,(18)(19)(20)(21)(22). Moreover, MD simulations have shown that, with few exceptions [e.g., SO 4 2− in (NH 4 ) 2...

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“…[4][5][6][7][8][9][10] To overcome this issue, environmental XPS (E-XPS) has been developed [4][5][6][7][8][9][10] (note: in the present paper the term "environmental XPS" has been selected instead of "ambient-pressure XPS" and "high-pressure XPS" since the instrument presented here, as well as other XPS instrumentation up to date, [4][5][6][7][8][9][10] is not capable of performing spectroscopic measurements at pressures as high as 1 atm or higher.…”

Section: Introductionmentioning

confidence: 99%

“…11 Since then, improvements in the design of E-XPS systems have allowed measurements with progressively higher sensitivity to be performed. 8 The latest generation of E-XPS spectrometers incorporates a differential pumping system in combination with an electrostatic lens, allowing the acquisition of XPS spectra up to approximately 25 Torr with minimal photoelectron intensity losses. 4-8, 10, 12 Many of the E-XPS systems described in the literature and currently in use have been developed for operation at synchrotron light sources.…”

Section: Introductionmentioning

confidence: 99%

Angle-resolved environmental X-ray photoelectron spectroscopy: A new laboratory setup for photoemission studies at pressures up to 0.4 Torr

Mangolini

Åhlund

Wabiszewski

et al. 2012

Review of Scientific Instruments

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. (2012). Angle-resolved environmental X-ray photoelectron spectroscopy: A new laboratory setup for photoemission studies at pressures up to 0.4 Torr. Review of Scientific Instruments, 83(9) The paper presents the development and demonstrates the capabilities of a new laboratory-based environmental X-ray photoelectron spectroscopy system incorporating an electrostatic lens and able to acquire spectra up to 0.4 Torr. The incorporation of a two-dimensional detector provides imaging capabilities and allows the acquisition of angle-resolved data in parallel mode over an angular range of 14° without tilting the sample. The sensitivity and energy resolution of the spectrometer have been investigated by analyzing a standard Ag foil both under high vacuum (10 −8 Torr) conditions and at elevated pressures of N 2 (0.4 Torr). The possibility of acquiring angle-resolved data at different pressures has been demonstrated by analyzing a silicon/silicon dioxide (Si/SiO 2 ) sample. The collected angle-resolved spectra could be effectively used for the determination of the thickness of the native silicon oxide layer. The paper presents the development and demonstrates the capabilities of a new laboratory-based environmental X-ray photoelectron spectroscopy system incorporating an electrostatic lens and able to acquire spectra up to 0.4 Torr. The incorporation of a two-dimensional detector provides imaging capabilities and allows the acquisition of angle-resolved data in parallel mode over an angular range of 14 • without tilting the sample. The sensitivity and energy resolution of the spectrometer have been investigated by analyzing a standard Ag foil both under high vacuum (10 −8 Torr) conditions and at elevated pressures of N 2 (0.4 Torr). The possibility of acquiring angle-resolved data at different pressures has been demonstrated by analyzing a silicon/silicon dioxide (Si/SiO 2 ) sample. The collected angle-resolved spectra could be effectively used for the determination of the thickness of the native silicon oxide layer. Disciplines Mechanical Engineering

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Photoelectron spectroscopy under ambient pressure and temperature conditions

Cited by 238 publications

References 56 publications

Room-Temperature Reaction of Oxygen with Gold: An In situ Ambient-Pressure X-ray Photoelectron Spectroscopy Investigation

Room-Temperature Reaction of Oxygen with Gold: An In situ Ambient-Pressure X-ray Photoelectron Spectroscopy Investigation

Specific cation effects at aqueous solution−vapor interfaces: Surfactant-like behavior of Li ⁺ revealed by experiments and simulations

Angle-resolved environmental X-ray photoelectron spectroscopy: A new laboratory setup for photoemission studies at pressures up to 0.4 Torr

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Photoelectron spectroscopy under ambient pressure and temperature conditions

Cited by 238 publications

References 56 publications

Room-Temperature Reaction of Oxygen with Gold: An In situ Ambient-Pressure X-ray Photoelectron Spectroscopy Investigation

Room-Temperature Reaction of Oxygen with Gold: An In situ Ambient-Pressure X-ray Photoelectron Spectroscopy Investigation

Specific cation effects at aqueous solution−vapor interfaces: Surfactant-like behavior of Li + revealed by experiments and simulations

Angle-resolved environmental X-ray photoelectron spectroscopy: A new laboratory setup for photoemission studies at pressures up to 0.4 Torr

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Specific cation effects at aqueous solution−vapor interfaces: Surfactant-like behavior of Li ⁺ revealed by experiments and simulations