{"title":"Visualizing Ruby Emission Decay Lifetime with Slow-Motion Digital Cameras: A Demonstration for Students","authors":"Dinesh Dhankhar*, ","doi":"10.1021/acs.jchemed.4c0152910.1021/acs.jchemed.4c01529","DOIUrl":null,"url":null,"abstract":"<p >This short article describes a safe way of observing the emission decay from a ruby crystal using a photographic flash. This demonstration does not require the use of lasers and can be easily and safely performed in a classroom or a home setting. The ruby sample was optically excited with a short-duration photographic flash, and the subsequent relaxation of the excited state population through intermediate metastable states was monitored using three different types of slow-motion digital cameras. Monitoring the recorded video frames allowed visualization of the population decay kinetics. In addition, the measurement of frame intensities allowed for the computation of the excited state lifetime and decay rate constant. This demonstration can be utilized in several different chemical education courses at the advanced high school or undergraduate level, for example, in the courses that involve concepts related to photochemical reaction kinetics, flash photolysis, lasers, etc.</p>","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"102 5","pages":"2252–2258 2252–2258"},"PeriodicalIF":2.5000,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acs.jchemed.4c01529","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Chemical Education","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.jchemed.4c01529","RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
This short article describes a safe way of observing the emission decay from a ruby crystal using a photographic flash. This demonstration does not require the use of lasers and can be easily and safely performed in a classroom or a home setting. The ruby sample was optically excited with a short-duration photographic flash, and the subsequent relaxation of the excited state population through intermediate metastable states was monitored using three different types of slow-motion digital cameras. Monitoring the recorded video frames allowed visualization of the population decay kinetics. In addition, the measurement of frame intensities allowed for the computation of the excited state lifetime and decay rate constant. This demonstration can be utilized in several different chemical education courses at the advanced high school or undergraduate level, for example, in the courses that involve concepts related to photochemical reaction kinetics, flash photolysis, lasers, etc.
期刊介绍：
The Journal of Chemical Education is the official journal of the Division of Chemical Education of the American Chemical Society, co-published with the American Chemical Society Publications Division. Launched in 1924, the Journal of Chemical Education is the world’s premier chemical education journal. The Journal publishes peer-reviewed articles and related information as a resource to those in the field of chemical education and to those institutions that serve them. JCE typically addresses chemical content, activities, laboratory experiments, instructional methods, and pedagogies. The Journal serves as a means of communication among people across the world who are interested in the teaching and learning of chemistry. This includes instructors of chemistry from middle school through graduate school, professional staff who support these teaching activities, as well as some scientists in commerce, industry, and government.
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