How to convert cm^-1 into erg or joules

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Homework Help Overview

The discussion revolves around the conversion of the unit cm-1 into energy units such as erg or joules, with a focus on its application in a chemistry context related to crystal fields.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the nature of cm-1 as a unit and its relationship to energy, with one suggesting a connection to photon energy based on wavelength. Questions arise regarding the context of the unit's usage.

Discussion Status

Some participants provide insights into the limitations of converting cm-1 directly to energy units, while others suggest a specific context where this conversion might be relevant. There is acknowledgment of the need for context in understanding the unit's application.

Contextual Notes

The original poster mentions that the inquiry is related to a chemistry problem about crystal fields, which may influence the interpretation of cm-1 in this scenario.

AutisticAlien
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I'm not sure if this is the right place for this, but I can't seem to find how to convert cm^-1 into erg or joules... It's a pretty dumb question, but I can't find the answer anywhere.

Thanks a lot in advance!
 
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You cant, because cm^(-1) is not a unit of energy. The base units of energy are m l t^(-2). For example Ergs are grams cm seconds^(-2) and Joules are kg m seconds^(-2).
 


The only meaning that I can think of for that is perhaps comparing the energy to that of a photon of wavelength one cm.

For example, a photon of wavelength 1mm would have an energy of 10 cm^(-1) and so on.

In that case the conversion factor would just be the energy of a photon wavelength 1cm, which is 100 h c, or about 1.99 x 10^(-23) Joules.

In what context did you see this unit used Alien?
 


Failed to mention context, sorry. But yes, it was the way you predicted. Thank you very much!

It was a Chemistry problem about crystal fields.
 

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