Femtosecond Laser Matter Interaction

飞秒激光物质相互作用

• 批准号: 238678-2012
• 负责人: Sanderson, Joseph
• 金额: $ 1.82万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=570472
• 关键词: Femtosecond; Laser; Matter; Interaction

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.

激光诱导的库仑成像的技术利用超短激光脉冲的强烈场来迅速连续地从分子中去除许多电子。然后将分子还原为其成分原子离子，该原子离子用静电力相互排斥，并以与初始分离有关的能量飞行。 如果我们可以使用时间和位置敏感检测来检测所有这些离子，那么可以推断分子的初始几何形状以及在爆炸过程中分子的动力学。该研究计划将通过帮助我们更好地理解物理学来提高过程的能力。 我们将使用多种方法来帮助我们理解这些物理过程，其中包括使用与当前的高强度激光脉冲相比，在东京大都会大学使用高度充电的离子碰撞，以及在加拿大光源的同步辐射的高强度激光脉冲，以帮助了解通过核心通过电子电源来了解多个电离的潜在。 使用基于激光的成像的最大动机之一是激光的可控性，它们能够访问要访问的特定能量状态，从而通过紫外“泵”脉冲启动的动态，然后是成像“探针”脉冲，可以记录“分子电影”。这将是在高级激光源实验室中可以使用的，在那里我们将使用开发的UV辐射源来启动诸如C2H2等分子的质子转移过程，并使用红外脉冲附近的几个循环对过程进行映像。 在滑铁卢，我们将解决使用大分子使用库仑成像方法的最大障碍之一，我们将与TMU的合作者合作，他们开发了一个新的探测器，该检测器有可能获得接近100％的效率，从而实现了最终将大型分子成像的目标。 我们将测试滑铁卢的新一代探测器，并旨在制作迄今为止最大的分子的图像。