Max-Born Institut, Max-Born Strasse 2A, 12489 Berlin, Germany.
Phys Rev Lett. 2013 Jul 19;111(3):033001. doi: 10.1103/PhysRevLett.111.033001. Epub 2013 Jul 18.
Photoinduced molecular processes start with the interaction of the instantaneous electric field of the incident light with the electronic degrees of freedom. This early attosecond electronic motion impacts the fate of the photoinduced reactions. We report the first observation of attosecond time scale electron dynamics in a series of small- and medium-sized neutral molecules (N(2), CO(2), and C(2)H(4)), monitoring time-dependent variations of the parent molecular ion yield in the ionization by an attosecond pulse, and thereby probing the time-dependent dipole induced by a moderately strong near-infrared laser field. This approach can be generalized to other molecular species and may be regarded as a first example of molecular attosecond Stark spectroscopy.
光致分子过程始于瞬时入射光电场与电子自由度的相互作用。这种早期的阿秒电子运动影响光致反应的命运。我们报告了在一系列中小分子（N2、CO2和 C2H4）中阿秒时间尺度电子动力学的首次观察，通过阿秒脉冲的电离监测母体分子离子产率的时变，从而探测由中强近红外激光场诱导的时变偶极。这种方法可以推广到其他分子种类，并可被视为分子阿秒 Stark 光谱学的第一个例子。
