評論
打印
This all happens in one step as the reaction is progressing
這些都發生在反應的這一步中
Here's what's happening
發生的情況是這樣
This is the energy level of our reactants, A and B
這是反應物A和B的能級
When they react, they form C and D in its excited state
它們反應時，生成C和激發態的D
Now to relax back down to where it needs to be
之后D必須返回到基態
D emits energy as light
于是D會以光的形式釋放能量
Now there's a different amount of energy in our reactants than our products
反應物和產物之間存在能量差異
So that's why these two energy levels are different
所以這兩個能級是不同的
Alright, so in Dr. Dolhun's experiment
在Dolhun博士的實驗中
each volunteer have a cup containing a different chemical
每位志愿者都拿著裝有不同化學試劑的燒杯
and adds hydrogen peroxide to each cup
將另一個燒杯中的過氧化氫加入其中
And each cup glows a different color
每個燒杯發出不同顏色的光
red, blue, or green
紅色，藍色，綠色
This happens because the hydrogen peroxide is
這是因為過氧化氫
oxidizing each of the different chemicals
氧化了每一種化學試劑
So oxidation is the chemical reaction
這里發生的化學反應是氧化反應
that will ultimately cause the chemiluminescent
最終導致了化學發光
So why did each of these chemicals glow a different color?
為什么不同化學試劑會發出不同顏色的光呢
Well, it's because they each emitted a different amount energy
這是因為它們所釋放能量的量不同
and energy equals color
而能量等于顏色
So let's think of it in terms of a rainbow spectrum
我們以彩虹光譜來考慮這個
So the amount of energy increases as you move up the spectrum
能量的量隨光譜往上會逐漸增加
So red is lower energy than blue
紅光的能量低于藍光
So if the difference between the ground state and the excited state is small
如果基態和激發態之間的差異較小
there's a smaller amount energy released
釋放的能量會較少
and the light is on the redder side of the spectrum
發出的光就會偏往光譜的紅色方向
Conversely if that gap is larger, there's more energy released
相反，如果能差較大，釋放的能量較多
so the light is on the bluer side of the spectrum
發出的光就會偏往光譜的藍色方向
and this chemiluminescence chemistry has practical uses
這種化學發光具有實際用途
beyond glow sticks that light up a good party
不局限于派對上使用的熒光棒
We also use reactions like these to create flares that don't get too hot
我們還利用這樣的反應來創造熱量不高的閃光
in use of emergency situations
用于緊急情況
and nature uses chemiluminescence too
大自然也會使用這些化學發光
Have you ever seen a firefly light up at night
你們見過晚上飛舞的螢火蟲嗎
or an angler fish hunt for prey?
還有捕食獵物的琵琶魚
You've seen bioluminescence
這些都是生物發光
which is chemiluminescence in a biological system
生物發光就是生物系統的化學發光
It's the exact same principle as the chemical reactions that Dr. Dolhun showed us
這同Dolhun博士所演示的化學實驗是同一個原理
Hope you enjoy the video. I'll see you next time
但愿你們喜歡這個視頻，我們下次再見
