From 43c5b696aaf421dec7aee967002999d9145da35e Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Tue, 1 Feb 2022 11:23:35 +0100
Subject: Expand knowledge base

---
 content/know/concept/einstein-coefficients/index.pdc | 1 +
 1 file changed, 1 insertion(+)

(limited to 'content/know/concept/einstein-coefficients')

diff --git a/content/know/concept/einstein-coefficients/index.pdc b/content/know/concept/einstein-coefficients/index.pdc
index f0f0f96..b56af77 100644
--- a/content/know/concept/einstein-coefficients/index.pdc
+++ b/content/know/concept/einstein-coefficients/index.pdc
@@ -7,6 +7,7 @@ categories:
 - Optics
 - Electromagnetism
 - Quantum mechanics
+- Two-level system
 
 date: 2021-07-11T18:22:14+02:00
 draft: false
-- 
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