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Listen to part of a lecture in a chemistry class.
Okay.
I know you all have a lot of questions about this lab assignment that's coming out so I 'm going to take a little time this morning to discuss it.
So, you know the assignment has to do with Spectroscopy, right?
And your reading should help you get a good idea of what that's all about.
But, let's talk about Spectroscopy a little now just to cover the basics.
What is Spectroscopy?
Well, the simplest definition I can give you is that Spectroscopy is the study of the interaction between matter and light.
Now, visible light consists of different colors or wavelengths, which together make up what's called spectrum,a band of colors, like you see in a rainbow.
And all substances, all forms of matter, can be distinguished according to what wavelength of light they absorb and which ones they reflect.
It's like, um, well, every element has, what we call, its own spectral signature.
If we can read that signature, we can identify the element.
And that's exactly what spectroscopy does.
Now, Laser Spectroscopy, which is the focus of your assignment, works by measuring very precisely what parts of the spectrum are absorbed by different substances.
And it has applications in a lot of different disciplines.
And your assignment will be to choose a discipline that interests you, and devise an experiment.
For example, I 'm going to talk about art.
I 'm interested in the art and to me it's interesting how spectroscopy is used to analyze art.
请听化学课上的一篇演讲
好的,
我知道你们对此次的实验作业都有很多问题,因此今天早上我将花点时间跟你们讨论一下。
那么,你们知道此次作业是跟光谱学有关的,是吧?
你们通过阅读应该能够很好了解这个概念。
但是,我们还是将一些光谱学的基本要点过一遍吧。
什么是光谱学呢?
嗯,我能给你们的最简单的定义就是,光谱学是关于物和光之间相互作用的研究。
光谱是一条五颜六色的缎带,就像你看到的彩虹一样。
而所有的物质和物质形式都可以根据其吸收的光的波长和其反射的光来加以区分。
它就像,嗯,什么元素都有,我们所说的,它本身的光谱签名。
如果我们可以读懂,我们就可以知道是什么元素。
这正是光谱学的作用所在。
激光光谱学是你们作业中的重点,它能非常精确地测量光谱中哪一部分被不同的物质吸收。
该门学科在不同学科中有所应用。
你们的任务就是要选择一门你感兴趣的学科然后进行实验。
比如说,我要谈谈关于艺术这门课。
我对艺术很有兴趣,我对光谱学是怎么应用在对艺术的分析上的问题感兴趣。
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