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Review of Scientific Instruments
Volumn 65, Issue 4, 1994, Pages 918-921
A tunable microwave frequency alternating current scanning tunneling microscope
Author keywords

[No Author keywords available]
Indexed keywords

EID: 36449005202     PISSN: 00346748     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1144921     Document Type: Article
Times cited : (34)
References (16)
  • 10
    • 84951354551 scopus 로고    scopus 로고
    • In place of a dc voltage source, we use a microwave signal source with 1 Hz resolution [Hewlett-Packard 83620A/008 (Hewlett-Packard Co., Palo Alto, CA)] attached via microwave coaxial cable to either the ACSTM tip or a conducting substrate behind the sample. The signal at the modulation frequency is detected using a microwave network analyzer [Hewlett-Packard 8510C/8514B (Hewlett-Packard Co., Palo Alto, CA)]. The background “pickup” signal which made measurements at the fundamental difficult in the experiments of Kochanski (Ref. 1) can be blanked using this scheme. In order to record the amplitudes at the harmonics of the modulation frequency or to use a particular (i.e., third) harmonic for feedback control of the tip height, we use a microwave spectrum analyzer [Hewlett-Packard 71210C (Hewlett-Packard, Palo Alto, CA)]. Both source and detection electronics have narrow bandwidths, making impedance matching less critical than in the scheme described in Ref. 3
  • 11
    • 84951354550 scopus 로고    scopus 로고
    • Duramic Products, Leonia, NJ
  • 12
    • 84951354553 scopus 로고    scopus 로고
    • Torr [formula omitted] Varian Associates, Inc., Lexington, MA
  • 13
    • 84951354552 scopus 로고    scopus 로고
    • We have conducted preliminary measurements at reduced temperature (77 K) and ultrahigh vacuum. The waveform amplitude for operation at 77 K is 85 V with increased waveform asymmetry. This amplitude increase is used to overcome the reduction in gain of the piezoelectric transducers at low temperatures
  • 15
    • 84951354554 scopus 로고    scopus 로고
    • This 20-cm-diameter metal can leads to a number of cavity resonances which cause a background spectrum less uniform than that shown in Ref. 5. Various schemes can be used to flatten this background, and will be discussed in a future publication
  • 16
    • 84951354536 scopus 로고    scopus 로고
    • Barry Controls, Watertown, MA

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.