Skip to main content
main-content

Über dieses Buch

This thesis addresses two important and also challenging issues in the research of chemical reaction dynamics of F+H2 system. One is to probe the reaction resonance and the other is to determine the extent of the breakdown of the Born-Oppenheimer approximation (BOA) experimentally. The author introduces a state-of-the-art crossed molecular beam-scattering apparatus using a hydrogen atom Rydberg "tagging" time-of-flight method, and presents thorough state-to-state experimental studies to address the above issues. The author also describes the observation of the Feshbach resonance in the F+H2 reaction, a precise measurement of the differential cross section in the F+HD reaction, and validation of a new accurate potential energy surface with spectroscopic accuracy. Moreover, the author determines the reactivity ratio between the ground state F(2P3/2) and the excited state F*(2P1/2) in the F+D2 reaction, and exploits the breakdown of BOA in the low collision energy.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract
The nature of chemical reactions is the breaking of old bonds and the formation of new bonds. Molecular reaction dynamics is the study on how the old bonds are broken and how the new bonds are formed. In the past few decades, molecular reaction dynamics is an important field of physical chemistry and chemical physics. Its main task is to study elementary chemical reaction processes on the atomic scale and femtosecond (even attosecond) time scale. The in-depth study of this field offers important knowledge to atmospheric chemistry, interstellar chemistry, as well as combustion chemistry, and deepens our understanding of the essential nature of chemical reactions in nature.
Zefeng Ren

Chapter 2. Hydrogen Atom Rydberg Tagging Time-of-Flight Crossed Molecular Beam Apparatus

Abstract
This chapter focuses on hydrogen atom Rydberg tagging time-of-flight (HRTOF) crossed molecular beam apparatus, which was used for the research described in this thesis. In Sect. 2.1, I will introduce the general knowledge of molecular beam and crossed molecular beam and some history; HRTOF technique is described in Sect. 2.2; the vacuum system, detection and acquirement system, as well as the resolution of the apparatus are described in detail in Sect. 2.3.
Zefeng Ren

Chapter 3. Dynamical Resonances in F + H2 Reactions

Abstract
F + H2 reaction first attracted attention due to the application of chemical laser. This is the first reaction which has product vibrational state resolved measurements. Using chemical laser and infrared light emitting, researchers found that the population of the product HF vibrational states is highly inverted. Crossed molecular beam studies of this system are the main work of Yuan Tseh Lee’s Nobel Prize in Chemistry in 1986. In this chapter, studies on resonance phenomenon in the F + H2 reaction are mainly described. In Sect. 3.1, studies on resonance in the F + H2 reaction are reviewed; crossed molecular beam studies in the F(2P2/3) + H2 → HF + H reaction are introduced in Sects. 3.2 and 3.3 discusses the studies of the F(2P2/3) + HD → HF + H reaction, and the last section is a summary.
Zefeng Ren

Chapter 4. The Non-adiabatic Effects in F(2P) + D2 → DF + D

Abstract
Using HRTOF crossed molecular beam technique, we studied the F(2P) + D2 → DF + D reaction systematically. The differential cross sections and the relative integral cross sections in this reaction were provided. We measured the F(2P3/2)/F*(2P1/2) ratio in the F atom beam and thus got the F(2P3/2)/F*(2P1/2) reactivity ratio, which is in perfect agreement with the theoretical results.
Zefeng Ren

Backmatter

Weitere Informationen

Premium Partner

    Bildnachweise