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AC-2S Series Photoemission Yield Spectroscopy in Air

For quick and easy measurements of work function and ionization potential

The AC-2S Series (AC-2S / AC-2S Pro α / AC-2S Pro β) use the principle of Photoemission Yield Spectroscopy in Air (PYSA) for quick easy measurement of work function and ionization potential; eliminating the need for measurements in a vacuum.

The AC-2 open counter counts the individual low intensity photoelectrons emitted when the sample surface is irradiated with weak low-energy UV light in air. Compared to conventional surface analysis in which high-energy X-rays are passed through the sample in a vacuum, this analysis technique causes minimal damage to the sample.

The AC Series is widely used around the world in universities and research facilities, with over 2,000 related articles published in scientific journals.

Product Features


・Ionization potential measurement of organic light-emitting diodes and photoreceptors for photocopiers
・Tribology research on hard disks and magnetic tape
・Semiconductor and lead frame surface oxidization state measurement
・Detection of molecular level film contamination of precision electronic materials
・Ionization potential measurement of the following functional materials
Organic light-emitting diodes, organic solar cells, organic field-effect transistors, photoreceptor materials for photocopiers, Perovskite solar cells, quantum dots, carbon nanomaterials, catalyst materials, storage batteries, fuel cells, semiconductor materials (e.g., Si, GaN, GaAs), transparent conductive film (e.g., ITO, FTO)


Product category

Photoemission Yield Spectroscopy in Air
Model AC-2S
Detection principle Photoemission Yield Spectroscopy in Air (detector: low-energy photoelectron counting)
Photoelectron detector Flat-plate open counter
UV energy range 3.4 - 6.2 eV (364 - 200 nm)
Minimum UV intensity 1.0 nW or less (at 5.9 eV)
Maximum UV intensity 500.0 nW or greater (at 5.9 eV)
Repeatability (standard deviation) Work function 0.02 eV (sample: Au plate)
UV light source D2 lamp
UV spot size Up to 4 mm × 4 mm (varies according to energy due to chromatic aberration of converging lens)
Maximum photoelectron count rate 4,000 cps​
Spectrometer Grating monochromator
Maximum sample size Area up to 50 mm × 50 mm, thickness up to 10 mm
Temperature/humidity range Temperature 15 °C - 35 °C (no sudden changes), up to 60 %RH (no condensation), dew point -30 °C or higher
Power source 100 V - 240 V AC​
50/60 Hz 5A (max.)​
* Excluding control PC
External dimensions LC light source: approx. 480 mm (W) × 450 mm (D) × 317 mm (H)​
DC measurement unit: approx. 465 mm (W) × 450 mm (D) × 360 mm (H)
Weight LC light source: approx. 25 kg
DC measurement unit: approx. 31 kg *Excluding control PC

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