DS-2101-0—For easy measurement of work function and ionization potential—

Atmospheric Photoelectron Yield
Spectrometers
AC-2S Series
AC-2S / AC-2S Pro α / AC-2S Pro β
CE Marking (pending)Features Allows easy measurement in the atmosphere without the need for producing a vacuum.
(Samples can be easily inserted and removed, reducing measurement time.) Detects minute photoemission levels by subjecting samples to low-intensity ultraviolet
radiation; offers high repeatability with minimal damage to samples.
 Compact size and light weight (approx. 21 % smaller footprint and 38 % lighter than theprevious model)* Comparison of the new AC-2S to the previous AC-2
 Product range includes the AC-2S, which offers improved ease of use compared to theprevious model, and the AC-2S Pro α and AC-2S Pro β, which offer expanded
functionality (① High-temperature measurement, ② New light source, ③ Micro area
measurement, ④ Low-energy measurement).

Principle
Spectrometer

Controller

UV lampE = hν = hc/λ(h: Planck constant, ν: frequency of the light, c: speed oflight, λ: wavelength)
Increasing the UV energy makes it possible to obtain thephotoemission threshold energy (work function*1 andionization potential*2) as shown on the PC screen to the right.
*1 Photoemission threshold energy for metals*2 Photoemission threshold energy for semiconductors

Opencounter

Optical fiberElectrons
SampleSample stage

X stage

Square root of electron count rate(CPS)

Ultraviolet light emitted from a UV lamp undergoes
wavelength (energy) selection in a spectrometer
before being focused on the surface of a sample
placed on the sample stage. An open counter(electron counting device) counts electronsdischarged by the photoelectric effect (phenomenonin which electrons are discharged from material
surface when the material absorbs light). The
wavelength λ of the ultraviolet light is converted intolight energy E as described by the following equation:

PCSystem
configuration
diagramThreshold energy⇒ Ionization potential⇒ Work function

UV energy (eV)PC screen

New Functions
The AC-2S Series includes the AC-2S Pro α/β models, which incorporate various new features notavailable with the previous model.
<High-temperature measurement> Capable of measurement at temperatures up to 100 °CA heated sample stage allows measurement at user-specified temperatures up to 100 °C.
⇒ This makes it possible to evaluate characteristics at actual operating temperatures—for example, for
new materials with temperature-dependent characteristics.
<New long-life, high-intensity light source> Lasts approx. ten times longer than the previousmodel
The laser-driven light source (LDLS) provides long service life (approx. ten times longer than the previousmodel), consistent measurements of materials requiring high light intensity (max. 2,500 nW: Pro α), andmicro area measurement capability with easy spot focusing (Pro β).
⇒ Extended service life eliminates the need to replace the light source. It also allows measurements of awide range of materials, including those requiring high light intensity.
<Micro area measurement>
Allows measurements of small spots (not larger than 0.4 mm square).
⇒ Small spot measurement capability allows measurements of semiconductors and other small-sizedmaterials.
<Low-energy measurement>
Capable of low-energy measurement as low as 2.0 eV⇒ Allows measurements of new low-energy photoemission materials that previously could not bemeasured.
Function

AC-2S

AC-2S Pro α

AC-2S Pro β

High-temperature measurement－〇〇

New long-life, high-intensity light source－〇〇

Micro area measurement－－〇

Low-energy measurement－〇－

Exterior Drawings
AC-2S light source unit (LC)Front

AC-2S measuring unit (DC)Side (DC connection side) Side (LC connection side)

Optical fiber connector

Front

Power switch
Optical fiber connector

AC-2S Pro α/β light source unit (LC)
Front

Side (DC connection side)

Sample door

AC-2S Pro α/β measuring unit (DC)Side (LC connection side)Front

Pro β only

Optical fiber connector

Power switch

Optical fiberconnector

External lead(heater wire)
Connection totemperature
controller

External lead(thermocouple wire)
Connection totemperature
controller

Sample door

Product Configurations
AC-2S

AC-2S Pro α/AC-2S Pro β[Overview]
The product consists of the light source unit (LC),measuring unit (DC), and PC used formeasurement.
Supply compressed air (0.1 - 0.2 MPa) via the dry
air inlet during measurement.

[Overview]
The product consists of the light source unit (LC),measuring unit (DC), laser-driven light source(LDLS) power supply, temperature controller, andPC used for measurement.
Supply compressed air (0.1 - 0.2 MPa) via the dry
air inlet during measurement.

[Installation/Dimensions]・ Width: Approx. 1,100 mm(LC + optical fiber + DC)・ Depth: Approx. 600 mm (LC/DC + rear cables)[Installation/Dimensions]・ Width: Approx. 1,400 mm(LDLS power supply + LC + optical fiber + DC +temperature controller)
・ Depth: Approx. 600 mm (LC/DC + rear cables)

USB cable
USB cable

Power supply cable
RS-232C cable

Dry air inlet(0.1 – 0.2 MPa)

Power supply cable

Dry air inlet(0.1 – 0.2 MPa)

RS-232C cable
AC power supply cable
Optical fiber

Optical fiber
AC power supply cable
LDLS power supply
AC power supply cable

Temperature controller

AC power supply cableSpecifications
Model
Measurement principle
Measurement energy
scanning range
Repeatability(standard deviation)
Measurement time

AC-2S

AC-2S Pro α

AC-2S Pro β

Photoemission yield spectroscopy in air (PYSA) (Detector: Low-energy electron count method)
3.4 - 6.2 eV(364 - 200 nm)

2.0 - 6.2 eV(620 - 200 nm)

3.4 - 6.2 eV(364 - 200 nm)

Work function 0.02 eV (sample: Au sheet)Standard time required for work function measurement: 10 seconds per unit energy

Maximum count

4,000 cps

UV lamp

Deuterium (D2) lamp

Laser-driven light source (LDLS)

Minimum light intensity

Up to 1.0 nW (at 5.9 eV)

Up to 5.0 nW (at 5.9 eV)Maximum light intensity

At least 500 nW (at 5.9 eV)

At least 2,500 nW (at 5.9 eV)

At least 200 nW (at 5.9 eV)

UV spot size

Not larger than 4 mm squareNot larger than 4 mm square

Not larger than 0.4 mm squareSpectrometer

Grating-type monochromator

Maximum sample size

50 mm × 50 mm, thickness 10 mm

Sample stage
Operating temperature/humidity range
Power supply
Compressed air supply
conditions

External dimensions

Weight

120 mm × 122 mm
Heated sample stage

115 mm × 122 mm

120 mm × 122 mm
Heated sample stage

15 °C - 35 °C (no sudden changes), up to 60 % RH (no condensation), dew point -30 °C or higher
100 - 240 V AC
50/60 Hz, 5 A (max)Main unit: 100 - 240 V AC, 50/60 Hz, 5 A (max)LDLS (AC adapter): 100 - 240 V AC, 50 - 60 Hz, 2.5 A
LDLS (main unit): 12 V DC, 120 W
Temperature controller: 100 V (±10 %) AC, 50/60 Hz, 1 A (max)
0.1 - 0.2 MPa

LC (light source unit): Approx.
480 (W) × 450 (D) × 317 (H)mm
DC (measuring unit): Approx.
465 (W) × 450 (D) × 360 (H)mm
AC-2S LC (light source unit):
Approx. 25 kg
AC-2S DC (measuring unit):
Approx. 31 kg

LC (light source unit)*: Approx. 623 (W) × 450 (D) × 317 (H) mm
DC (measuring unit):
Approx. 465 (W) × 450 (D) × 360 (H) mm
Temperature controller: Approx. 200 (W) × 150 (D) × 280 (H) mm* The LDLS power supply is housed in the LC (light source unit).
AC-2S LC (light source unit): Approx. 30 kg
AC-2S DC (measuring unit): Approx. 31 kg
Temperature controller: Approx. 5 kg

Optional Accessories (sold separately)

Accessories• Display• PC• Power supply cable (for LC)• Power supply cable (LC-DC)• Adapter plug (3-pin → 2-pin +ground wire)* AC-2S: ×1, Pro α/β: ×3• USB interface cable (PC-LC)

Up to 1.0 nW (at 5.9 eV)• RS-232C interface cable (LCDC)• Detector• Optical fiber• Accessory sample set• Tweezers• Measurement/analysis/data
conversion software (CD-ROM)• Tray for powder samples (1.0 mm deep) • Optical fiber• Tray for powder samples (0.5 mm deep)(for AC-2S/Pro α)• Compressor (with dry air generator)• Optical fiber (for Pro β)• Optical fiber protective acrylic cover• D2 lamp (for AC-2S)• Different-diameter union joint (for dry air) • Ozone filter• Detector (for replacement)

DS-2101-0