Femtosecond Laser Matter Interaction

激光诱导库仑成像技术利用超短激光脉冲的强场，快速连续地从分子中去除多个电子。然后，分子被还原为其组成的原子离子，这些原子离子通过静电力相互排斥，并以与它们最初分离相关的能量飞离。如果我们能用时间和位置灵敏的探测方法一致地探测到所有这些离子，那么就有可能推断出分子的初始几何形状，并可能推断出分子在爆炸过程中的动力学。该研究计划将专注于通过帮助我们更好地理解物理来提高这一过程的能力。 我们将使用多种方法来帮助我们了解这些物理过程，其中包括使用东京市立大学与高电荷态离子的碰撞来模拟比目前可能更短的高强度激光脉冲，以及使用加拿大光源的同步辐射来帮助了解通过核心电子碘化实现多重电离的可能性。 使用基于激光的成像的最大动机之一是激光的可控性，它们能够获取要访问的特定能量状态，从而通过UV“泵浦”脉冲和成像“探测”脉冲启动动力学，成像“探测”脉冲可以记录“分子电影”。在高级激光光源实验室，这将是可能的，在那里，我们将使用正在开发的紫外线辐射源来启动C2H2等分子中的质子转移过程，并使用几个周期的近红外脉冲来成像该过程。 在滑铁卢，我们将克服使用大分子库仑成像方法的最大障碍之一，我们将与TMU的合作者合作，他们开发了一种新的探测器，有可能达到接近100%的效率，最终实现对大分子进行成像的目标。我们将在滑铁卢测试新一代探测器，目标是制作迄今所取得的最大分子的图像。

The technique of laser induced Coulomb imaging uses the intense field of an ultrashort laser pulse to remove many electrons from a molecule in rapid succession. The molecule is then reduced to its constituent atomic ions which repel each other with electrostatic force and fly apart with energy related to their initial separation. If we can detect all of these ions in coincidence using time and position sensitive detection then it is possible to deduce the initial geometry of the molecule and possibly the dynamics of the molecule during the explosion process. The research program will focus on improving the capabilities of the process by helping us to understanding physics better. We will use a number of approaches to help us understand these physical processes, these will include using the collisions with highly charged ions at Tokyo Metropolitan University to simulate high intensity laser pulses shorter than currently possible, and synchrotron radiation at the Canadian Light Source to help understand the potential for multiple ionization through core electron ioinization. One of the biggest motivations for using laser based imaging is the controllability of lasers, their ability to access specific energy states to be accessed and thus dynamics to be initiated by a UV "pump" pulse followed by an imaging "probe" pulse which can record a "molecular movie". This will be possible at the Advanced Laser Light Source laboratory where we will use the developing UV radiation source to initiate the proton transfer process in molecules such as C2H2 and image the process using few cycle near infrared pulses. In Waterloo we will tackle one of the biggest barriers to using the Coulomb imaging method with large molecules, We will work with collaborators at TMU who have developed a new detector which has the potential to get close to 100% efficiency, making the goal of imaging large molecules in range finally. We will test new generation detectors in Waterloo and aim to make images of the largest molecules so far achieved.