Ultrahigh vacuum scanning tunneling microscope GPI 300


The device is designed for high-precision (atomic scale) study of processes occurring on metal and semiconductor surfaces under ultrahigh vacuum. The device makes it possible to record atomic resolution topograms of clean surfaces and those of adsorbed layers, and can be integrated into any analytical or technological vacuum unit.

Download: General description of ultra-high vacuum scanning tunneling microscope GPI 300 (in Russian):

icon STM GPI 300 (364 kB)


Unique Features

– Open architecture of the scanner to deliver gas, molecular and light (laser) beams directly onto the sample into the tunnel junction zone during the scanning process.
– Low noise control electronics and high vibroinsulation. The tip-sample gap deviation less than 4 pm.
– Tip positioning in X, Z coordinates in the range of 10×5 mm.





Operation temperature   300 К
Стандартные опции   топография
Scan (and offset) range (X,Y,Z)    1.8х1.8х2.0 mkm
Minimum step size (X,Y,Z)   0.001 nm
Область позиционирования (X,Z)   10х5 мм
Точность измерения межатомных расстояний   0.01 нм
Spatial resolution   atomic resolution on metals
Drift   0.2 nm/min
Механизм подвода и позиционирования   пьезо-инерционный
Tunneling current setpoint   10 пА - 50.0 нА
Resonance of spring suspension   2 kHz
Feedback loop type   digital, ADSP 2181
Размер образца (X,Y,Z)   10x10x4 мм (25х25х4 мм)
Vacuum achievable   5x10-11 Торр
Maximum bakeout temperature   160 С


Vacuum module design

The vacuum module is a cylinder of 150 mm in diameter with eight 40CF flanges on its side. A rigid frame with the scanner suspension system, arrester and wiring are fixed inside. The cylinder with the STM head can be mounted under the upper 160CF flange of an existing vacuum chamber. Samples and tips are changed with a universal rotary-drive mechanical arm on an XYZ stage, installed on the top flange of the cylinder. The scanner is suspended from the top of the cylinder on vertical springs with a resonance frequency ≈1 Hz, which acts as the first stage of STM vibration protection. 



The scanner consists of three piezoelectric tubes fixed on top of a copper cylinder-shaped platform (STM head). The tip holder is set in the spring clip on one of the outer piezoelectric tubes. A slider with a sample holder lies on the other two piezoelectric tubes, each ending with two polished sapphire balls. Slip-and-stick slider motion is used for sample-to-tip approach and positioning in a crosswise direction. Regulated hold-down force and sapphire/sapphire sliding pair ensures reliable slider motion under any vacuum.



Результаты тестов и измерений 

Атомное разрешение на плотноупакованных гранях металлов и других объектах — адсорбированных слоях:

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