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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Physics · 术语表

什么是 Absorption spectrum？

Definition 2.14 High School Physics · 第 2 章 — Light Spectra and the Message of Light

Send white light through a cool, low-pressure gas and disperse what comes out: the continuous rainbow reappears, but scored by thin dark lines. The gas has removed certain wavelengths from the passing light. Such a spectrum — a continuous background minus a set of lines — is an absorption spectrum.

The two spectra of hydrogen: bright emission lines (top) and dark absorption lines (bottom) at exactly the same wavelengths, 410, 434, 486 and 656\, nm. — The two spectra of hydrogen: bright emission lines (top) and dark absorption lines (bottom) at exactly the same wavelengths, $410$ , $434$ , $486$ and $656\,\mathrm{nm}$ .

示例

Example 2.17 (A flask of sodium vapor)

White light crosses a flask containing cool sodium vapor. The transmitted spectrum is a full rainbow with one dark line at $589\,\mathrm{nm}$ — precisely where a sodium lamp shines brightest. Looking at the flask from the side in a dark room, one sees the stolen light re-emitted: a faint yellow-orange gleam at that same wavelength.

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