Development of an ultralow current amplifier for scanning tunneling microscopy

被引：26

作者：

Carlà, M

Lanzi, L

Pallecchi, E

Aloisi, G

机构：

[1] Univ Florence, Dept Phys, I-50019 Florence, Italy

[2] INFM, I-50019 Sesto Fiorentino, Italy

[3] Univ Florence, Dept Chem, I-50019 Florence, Italy

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2004年 / 75卷 / 02期

关键词：

D O I：

10.1063/1.1641159

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A transimpedance amplifier for ultralow current scanning tunneling microscopy has been developed. Conditions for maximum signal-to-noise ratio have been explored, showing that best results can be obtained with a simple circuital arrangement. The amplifier associates a very high amplification factor (0.5 V/pA) to a sufficiently wide bandwith (1.6 kHz) and very low noise current (49 fA). Those features enable microscopy studies on an almost insulating surface, such as a freshly cleaved mica surface. (C) 2004 American Institute of Physics.

引用

页码：497 / 501

页数：5

共 18 条

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