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STM模拟实验: STM Simulator--Experiment Yourself!
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STM模拟实验: STM Simulator--Experiment Yourself! 荷兰奈美亨大学物理系，希望大家喜欢! How to work with the simulators We build a simple simulator which does not include noise, drift, creep, etcetera. Start simple simulator in a new window. (or in the original window.) A more extensive simulator imitates as best as possible a real STM. Most of the effects descibed earlyer like feedback, drift, creep, etcetera, you will find back in here. Start simulator in new window (of in original window.) What is included in the simulator? A feedback system which can become instabile at certain currents (oscillations). The noise and the sharpness in the topography (Z) or current (i, error signal) depends, among others, on the speed of scanning (line time). You can see both the Z (topography) and the i (current) by choosing another tab sheet. For fast scans the control system is not able to keep the current sufficiently constant so the topography will be distorted and traces of the height information will end up in the current. Several scan and zoom possibilities Try to get the best possible measurement by playing around with the settings When started the message bar indicates what options are on and where a special feature is hidden. When the creep and/or drift option are on it will be difficult to find the hidden feature (it moves away quickly, just as in a real experiment). The hidden feature can be very small as well as large and is very suitable to study the properties of the feedback system You will notice that the Zoom in/ Zoom out/Rotate/ functions are most helpful to find the right position. With some sound thinking and experimenting it must be possible to find the hidden feature. After finding it, it is possible to get an optimized image in topography or current signal. Of course there are more such hidden surprises and all are useful to see the influence of the control system on image formation. How do the buttons work? The value you type in is send to the simulation program allocated to you. At that moment the value indicated on your screen changes to red. As long as the numbers stay red there is no match between the value you requested and the value used by the simulation program. After checking the value, and possibly changing it, the simulation program sends the value back and puts it to black, meaning that it is accepted. It is possible that the requested value is forbidden. In that case the indicated value remains red or it will be changed to an allowed value by the simulator. Other points to keep in mind Different effect might occur during a measurement which can mess up the experiment. They do not always show up in the simulator but you can come across them: ..... 下载链接： http://www.spmlab.science.ru.nl/eng/experiment/ |
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