| E1 | 
| 4 | 
| E1 | 
| 9 | 
根据△E=
| hc | 
| λ | 
从第三能级跃迁到第二能级,
-
| E1 | 
| 9 | 
| E1 | 
| 4 | 
| hc | 
| λ1 | 
λ1=
| 36hc | 
| 5E1 | 
从第三能级跃迁到第一能级,
-
| E1 | 
| 9 | 
| hc | 
| λ2 | 
λ2=
| 9hc | 
| 8E1 | 
从第二能级跃迁到第一能级,
-
| E1 | 
| 4 | 
| hc | 
| λ3 | 
λ3=
| 4hc | 
| 3E1 | 
故C正确,A、B、D错误.
故选C.
| hc | 
| E1 | 
| 3hc | 
| 4E1 | 
| 9hc | 
| 8E1 | 
| 8hc | 
| 9E1 | 
| E1 | 
| 4 | 
| E1 | 
| 9 | 
| hc | 
| λ | 
| E1 | 
| 9 | 
| E1 | 
| 4 | 
| hc | 
| λ1 | 
| 36hc | 
| 5E1 | 
| E1 | 
| 9 | 
| hc | 
| λ2 | 
| 9hc | 
| 8E1 | 
| E1 | 
| 4 | 
| hc | 
| λ3 | 
| 4hc | 
| 3E1 |