WEEK+OF+SEPTEMBER+1ST

=**WEEK OF SEPTEMBER 1ST**= Type in the content of your page here. have first STM meeting tommorrow so exciting:) I kind of researched what STM is, and looked Lucianne's log book (she was one of my korean friends) and how she did. After researching it, I became to more attracted to this topic.

Today was my first STM meeting. I met with Dr. Loughran in Jordan Hall, reviewed STM instruments, spent most time with STM, and reviewed operation. (see video on STM home page.)Even though I wasn't able to understand what Dr.Loughran said (I didnt have any background knowledge.) I was pretty amazed by STM. It was such high technology that i have never met in my life.So after I got home, I researched several things about STM with note I wrote during the meeting today. 1981년 스위스의 뤼실리콘에 있는 [|국제사무기기회사](IBM) 취리히 연구소의 G. [|비니히]와 H. [|로러]가 표면의 국부 전도도를 연구하기 위한 장치를 만들면서부터 주사 터널링 현미경(STM)이 출현했다. 이것의 작동 원리는 [|터널링]이라고 알려진 양자역학적인 현상에 근거를 두고 있는데, 터널링이란 전자의 [|파동]성 때문에 전자가 고체의 표면을 뛰어넘어 고전물리의 법칙으로는 갈 수 없을 것이라 생각되는 곳까지 뚫고나가는 현상을 일컫는다. 이렇게 터널링된 전자를 발견할 확률은 표면으로부터의 거리가 증가함에 따라 지수함수적으로 감소한다. STM은 거리에 대한 이 극단적인 민감성을 이용하는 것이다. 텅스텐으로 만들어진 뾰족한 바늘의 끝이 시료 표면으로부터 수Å(옹스트롬) 정도의 거리에 놓인다. 이 탐침과 표면 사이에 소량의 전압을 걸어주면 전자가 이 틈 사이를 터널링하게 된다. 탐침을 표면에 걸쳐 움직이면서 터널링 전류의 변화가 기록되고 이 정보로부터 표면 지형의 상(像)을 얻을 수 있다. (Yes, this is korean. But since STM requires lots of scientific terms, i couldnt well understand what its about in english so i just found the information in korean, and since it is my log book i wanted to post it.)
 * __09-02-09__**

STM? -probe microscope -employs quantum mechanics How it works? -scans an electrican probe over a surface be imaged to detect a weak electric current flowing between the tip and the surface Use for -surface roughness -surface defects -the size of molecules.

SPM=STM (Scanning Probe Microscope) Dr.L's lab sturcture)

(I am writing this down on sunday)
 * 09-04-09**

I went to the lab. It was my second time. Dr.L taught me how to conduct the STM. It requires me so many stept so conduct as it seems complex.

1.tip should be clean and has to be perfect. (wash my hands before touching) 2. use pincer and cutter to pick or handle it -> use pincher to grasp a lirrle bit of end of wire ( it is so expensive by the way) -> cut it steep with cutter (total lengh should be 2~3 mm) 4. grasp the tup with tweeser 5. pull and cut the wire ar the same time 6. put the tip under the yellow(gold-colored clip cross position) 7.put the cylinder on the machine 8. Make sure to have some distance beteween tip and cylinder(not to touch each other) 9.power on 10. start the program on the computer 11. pull up "imaing window"-> "position window"->"advance"-> then cylinder should be moving closer to tip


 * condition is important

By the way, we failed to see clear image that day.Its because the STM we conducted was new so it was not familiar. But I hope I can see the image next time