Photoelectron Spectroscopy · 光电子能谱
| English | 中文 | Pinyin · 拼音 |
|---|---|---|
| photoelectron spectroscopy/ˌfəʊtəʊɪˈlektrɒn spekˈtrɒskəpi/ | 光电子能谱 | guāng diàn zi néng pǔ |
| binding energy/ˈbaɪndɪŋ ˈenədʒi/ | 结合能 | jié hé néng |
Knocking electrons loose
- Shine high-energy light on an atom and electrons fly off.
- How hard each one was held shows up in how fast it leaves.
- Collect them and you get a chart of steps and peaks.
- That chart is a direct map of an atom's inner shells.
把电子敲出来
- 用高能光照射原子,电子就飞出来。
- 每个电子被抓得多紧,体现在它飞出的快慢上。
- 把它们收集起来,你得到一张由台阶和峰组成的图。
- 那张图是原子内层的直接地图。
Measuring how tightly held
- Photoelectron spectroscopy 光电子能谱 (PES) ejects electrons with photons.
- Each electron's binding energy 结合能 is how tightly it was held.
- Electrons closer to the nucleus need more energy to remove.
测量被抓得多紧
- 光电子能谱(PES)用光子把电子打出来。
- 每个电子的结合能就是它被抓得有多紧。
- 离核越近的电子,越需要更多能量才能移走。
Electrons closer to the nucleus have a higher binding energy. · 越靠近原子核的电子具有较高的结合能。
They are held tighter, so more energy is needed to remove them. · 它们被束缚得更紧，因此需要更多能量才能移除。
Photoelectron spectroscopy measures the energy needed to... · 光电子能谱用于测量移除……所需的能量。
PES ejects electrons and records their binding energies. · PES 发射电子并记录其结合能。
What each peak means
- Each peak stands for one subshell.
- Peak position gives the binding energy (higher means closer to the nucleus).
- Peak height is proportional to the number of electrons in that subshell.
每个峰的含义
- 每个峰代表一个亚层。
- 峰的位置给出结合能(越高表示离核越近)。
- 峰的高度与该亚层的电子数目成正比。
In a PES spectrum, the height of a peak is proportional to... · 在 PES 谱中，峰高与……成正比。
More electrons in a subshell means a taller peak. · 亚层中的电子越多，峰越高。
The subshell with the highest binding energy is the one closest to the ____. · 结合能最高的亚层是离____最近的。
Closest to the nucleus = held tightest = highest binding energy. · 离原子核最近 = 束缚最紧 = 结合能最高。
From spectrum to configuration
- The peaks line up with the electron configuration.
- A $2p^6$ subshell gives a peak three times taller than a $2s^2$ one.
- So PES confirms how the electrons are arranged.
从能谱到排布
- 这些峰与电子排布一一对应。
- $2p^6$ 亚层给出的峰是 $2s^2$ 的三倍高。
- 所以 PES 证实了电子是如何排布的。
Neon's PES shows peaks of relative height 2:2:6. These correspond to... · 氖的 PES 显示出相对高度比为 2:2:6 的峰。这些对应于……
$2:2:6$ matches $1s^2\ 2s^2\ 2p^6$. · $2:2:6$ 对应 $1s^2\ 2s^2\ 2p^6$。
A filled $2p$ subshell gives a PES peak three times taller than a filled $2s$. · 充满的$2p$亚层产生的 PES 峰高是充满的$2s$的三倍。
$2p$ holds 6 electrons versus 2 in $2s$, a 3:1 height ratio. · $2p$ 容纳 6 个电子，而 $2s$ 容纳 2 个，高度比为 3:1。
Neon's PES has three peaks in the height ratio 2 : 2 : 6.
- These are the $1s$, $2s$, and $2p$ subshells.
- The $1s$ peak sits at the highest binding energy, closest to the nucleus.
氖的 PES 有三个峰,高度比为 2 : 2 : 6。
- 它们是 $1s$、$2s$、$2p$ 亚层。
- $1s$ 峰位于结合能最高处,离核最近。
Match the PES peaks · 匹配 PES 峰
In a photoelectron spectrum, peak position shows binding energy and peak height shows how many electrons. Match each peak to its subshell in sodium. · 在光电子能谱中，峰的位置表示结合能，峰高表示电子数量。将每个峰与其在钠中的亚层对应起来。
Higher binding energy means the electron is held tighter and closer in, so the $1s$ peak is always on the high-energy side. Peak height reflects the electron count, not the energy. And PES charts often plot energy increasing to the left, so read the axis direction carefully.
结合能越高,电子被抓得越紧、越靠内,所以 $1s$ 峰总在高能一侧。峰的高度反映电子数目,而不是能量。而且 PES 图常把能量向左增大,所以要仔细看坐标轴的方向。
Photoelectron spectroscopy ejects electrons with photons and measures each one's binding energy. Every peak is a subshell: its position gives the binding energy (higher = nearer the nucleus) and its height gives the electron count. A spectrum like neon's 2 : 2 : 6 reads straight off as $1s^2\,2s^2\,2p^6$.
光电子能谱用光子把电子打出来,并测量每个电子的结合能。每个峰是一个亚层:位置给出结合能(越高=离核越近),高度给出电子数目。像氖的 2 : 2 : 6 这样的能谱,可直接读作 $1s^2\,2s^2\,2p^6$。