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State of the art hemispherical energy analyzer with 2D-CCD/CMOS detector for photoelectron spectroscopy measurements (XPS and UPS) in the pressure regime from UHV to near ambient pressure (NAP)

The PHOIBOS 150 NAP Analyzer is a true 180° hemispherical energy analyzer with 150 mm mean radius. It consists of a differentially pumped electrostatic pre-lens, with a three-stage differentially pumped PHOIBOS 150 analyzer. Thus, the design concept provides four separate pressure stages separated by apertures. The first pumping stage (pre-lens) is separated from the analytic chamber by a nozzle with a customizable opening at the tip with diameters between 0.3 mm and 1 mm. By using a turbopump on the pre-lens stage, a pressure difference of four orders of magnitude (compared to the analysis chamber) can be achieved.The first and second stages are separated by an aperture. An in-lens gate valve allows a high-vacuum seal between of the PHOIBOS 150 Analyzer and NAP pre-lens and enables venting of the analysis chamber and pre-lens without venting the energy analyzer.

For Imaging NAP-XPS the pre-lens can be equipped with the SPECS NAP-XPS Imaging Lens Module that supports two different operation modes, one optimized for lateral resolution and one for transmission. In the lateral resolving mode the acceptance angle can be freely adjusted between +/- 3° to +/- 8° giving an ultimate lateral resolution of better than 10 µm with an acceptance area of 0.6 mm in diameter.


  • Wide Angle Pre-Lens with 44 ° Acceptance Angle
  • Near Ambient Working Pressures up to 100 mbar (depending on configuration)
  • Large pass energy range
  • Working range up to 3.5 keV (upgradable to 7 keV with corresponding power supply and detector)
  • High energy and angular resolution
  • High spatial resolution with imaging lens module
  • Ultimate flexibility by switching between high transmission and high lateral resolution mode
  • Fast detectors with high dynamic range for fast real time data acquisition in snapshot mode
  • Pneumatic in-lens gate valve
  • 4 differential pumping stages
  • Full detector flexibility (MCD, 1D-DLD, 2D-DLD, 2D-CCD/-CMOS)

R&D100 in 2010
The PHOIBOS 150 NAP Analyzer won the R&D 100 award for the best 100 products developed in 2010.




Energy Dispersion



8 Entrance, 3 Exit slits and Iris aperture

Magnetic Shielding

Double µ-Metal Shielding

Lens Modes

Angular Resolving, Transmission and Magnification (Lateral Resolution) Lens Modes

Kinetic Energy Range

0 - 3500 eV

Pass Energies

0 - 550 eV continously adjustable


2D-CCD/CMOS Detector

Measurement Modes

Snapshot mode, Sweeping mode, Fixed energy mode

Energy Window

13% of Pass Energy

Electric Isolation

up to 7 keV


HSA 3500 plus HT 101 for analyzer and HSA 3500 plus HT 173 for pre-lens

Working Pressure

up to 30 mbar (higher pressure values achievable with corresponding nozzle diameters and differential pumping packages)

Mounting Flange

DN150 CF (8" OD)

Working Distance

300 - 500 µm (for standard nozzle with 300 µm diameter)

Acceptance Angle


Angular Resolution

< 0.7°

Energy Resolution

< 10 meV

Lateral Resolution

<15 μm (guaranteed), <10 μm (achievable) with imaging lens module

Smallest Acceptance Spot

Without imaging lens module the smallest acceptance spot is defined by the excitation spot of X-ray source or nozzle diameter

Detector Channels

1900 x 1200 (with channel binning)

XPS Count Rates UHV

70 kcps (guaranteed), 150 kcps (achievable) *

XPS Count Rates 10 mbar

7 kcps (guaranteed), 15 kcps (achievable) *

XPS Count Rates 25 mbar

0.5 kcps (guaranteed), 1.5 kcps (achievable) *


* Ag 3d, FWHM < 0.85 eV, small spot monochromated X-ray source µ-FOCUS 600, Al Kα anode, 20 W, Spot size < 250 µm





  1. (2019) Surface Plasmon Enabling Nitrogen Fixation in Pure Water through a Dissociative Mechanism under Mild Conditions

    Nitrogen fixation in a simulated natural environment (i.e., near ambient pressure, room temperature, pure water and incident light) would provide a desirable approach to future nitrogen conversion. As N≡N triple bond has a thermodynamically high cleavage energy, nitrogen reduction under such mild conditions typically undergoes associative alternating or distal pathways rather than follows a dissociative mechanism. Here we report that surface plasmon can supply sufficient energy to activate N2 through a dissociative mechanism in the presence of water and incident light, as evidenced by in-situ synchrotron radiation-based infrared spectroscopy and near ambient pressure X-ray photoelectron spectroscopy. Theoretical simulation indicates that the electric field enhanced by surface plasmon, together with plasmonic hot electrons and interfacial hybridization, may play a critical role in N≡N dissociation. Specifically, AuRu core-antenna nanostructures with broaden light adsorption cross section and active sites achieve an ammonia production rate of 101.4 μmol·g-1·h-1 without any sacrificial agent at room temperature and 2-atm pressure. This work highlights the significance of
    surface plasmon to activation of inert molecules, serving as a promising platform for developing novel catalytic systems.

    C. Hu, X. Chen, J. Jin, Y. Han, S. Chen, H. Ju, J. Cai, Y. Qiu, C. Gao, C. Wang, Z. Qi, R. Long, L. Song, Z. Liu, Y. Xiong
    J. Am. Chem. Soc., Just Accepted Manuscript • Publication Date (Web): 30 Apr 2019
    Read more


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Channelplates Set - 1 pair MCP 40

Spare channelplate set for all 40 mm CCD detectors

Phosphor screen

Spare phosphor screen for all 40 mm CCD detectors. Exchange with channelplates is recommended.

Cu gasket for PHOIBOS 150

PHOIBOS 150 analyzer main flange gasket for Releases R5, R6, R7

Nozzle 0,3 mm, double coated

Nozzle 0,3 mm for 7 kV PHOIBOS 150 Backfilling Pre-Lens

Nozzle 1,0 mm, double coated

Nozzle 1,0 mm for 7 kV PHOIBOS 150 Backfilling Pre-Lens

Rotary feedthrough for IRIS

Replacement feedthrough for PHOIBOS Release R5 & R6 iris mechanism

Spindle with Spur and Bevel Gear for Iris

Replacement spindle for PHOIBOS Release R5 & R6 iris mechanism

Tubus 3 with Iris

Replacement iris mechanism for PHOIBOS Release R5 & R6