理论分析振动态H2+偶次谐波的辐射机制

理论研究和认证了振动态H_2~+偶次谐波的辐射机制.结果表明,偶次谐波是由于谐波辐射在激光上升和下降区间的不对称效应所产生的.具体来说,在低振动态下,偶次谐波主要来源于激光下降区间.随着振动态增大,来源于激光下降区间的偶次谐波强度减弱;但是,一些来源于激光上升区间的偶次谐波逐渐增强.

Theoretical investigation of the even-order harmonics from vibrating H2+

The generations of the even-order harmonics from vibrating H2+ have been theoretically investigated and identified. The results showed that due to asymmetric harmonic emission (asymmetric half-wave profile) on the rising and the falling parts of the laser field, the even-order harmonics can be generated. In detail, for the case of the lower initial vibrational state, the even-order harmonics mainly come from the falling part of the laser field; while as the initial vibrational state increases, the identified even-order harmonics on the falling part of the laser field decreases; while some other even-order harmonics coming from the rising part of the laser field are gradually enhanced.