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Introduction to the examples

Applying our modular model for experimental sciences described in chapter 4 to the domain of experimental molecular dynamics, we have formulated domain-specific rules for writing and evaluating modular articles, which are given in appendix A. Following these rules, we have composed the modular versions of the two articles that are presented in appendix #ap-modules">C. We assume that an appropriate hypermedia implementation of modular articles will be available to `real' readers.5.7

 
Table 5.1: a) The sections in the original version and b) the modules in the modular version of A05 and A08
!21cm
a) Sections of the original version b) Modules of the modular version
A05: A05:
1. Introduction A05-m2 Positioning
2. Experimental   A05-m2a Situation
3. Results   A05-m2b Central problem
4. Discussion A05-m3 Methods
  4.1 $\Delta E$ determination   A05-m3a Experimental methods
  4.2 $\alpha_{Br^-_2}$ determination   A05-m3c Theoretical methods
  4.3 Rc determination A05-m4 Results
  4.4 $\epsilon$ determination   A05-m4a Raw data (A05-m4ai experimental;
  4.5 $\rho$ determination   A05-m4aii theoretical)
  4.6 H12 determination   A05-m4b Treated results
5. An appendix     A05-m4bi Experimental
        A05-m4bii Theoretical
    A05-m5 Interpretation
      A05-m5a Qualitative interpretation
        A05-m5ai Classical interpretation
        A05-m5aii Quantum interpretation
      A05m5b Quantitative interpretation
        A05-m5bi Potential, deflection
        A05-m5bii Differential cross section
    A05-m6 Outcome
      A05-m6a Findings
      A05-m6b Leads for further research
A08: A08:
1. Introduction A08-m2 Positioning
2. Experimental   A08-m2a Situation
  2.1 Sodium beam   A08-m2b Central problem
  2.2 Iodine beam A08-m3 Methods
  2.3 Detector   A08-m3a Experimental methods
  2.4 Detection technique   A08-m3c Theoretical methods
  2.5 Data     A08-m3ci Transition probability
3. Potential curves       A08-m3ci1 Landau-Zener
4. Calculations       A08-m3ci2 Rotation
5. Measurements     A08-m3cii Differential cross section
6. Comparison of the measurements A08-m4 Results
and the calculations   A08-m4a Raw data (A08-m4ai experimental;
  6.1 Rainbow oscillation   A08-m4aii theoretical)
  6.2 Repulsive scattering oscillation   A08-m4b Treated results
7. Discussion     A08-m4bi Experimental
8. Rotational coupling       A08-m4bi1 Measured differential cross sections
9. Conclusions       A08-m4bi2 Measured rainbow structure
        A08-m4bii Theoretical
          A08-m4bii1 Potential and deflection curves
          A08-m4bii2 Calculated differential cross sections
          A08-m4bii3 Calculated rainbow structure
    A08-m5 Interpretation
      A08-m5a Qualitative interpretation
      A08-m5b Quantitative interpretation
        A08-m5bi Potential, deflection, LZ
        A08-m5bii Differential cross sections
          A08-m5bii1 Landau-Zener coupling
          A08-m5bii2 Landau-Zener and rotational coupling
    A08-m6 Outcome
      A08-m6a Findings
      A08-m6b Leads for further research
 

The first of these articles, (Delvigne and Los, 1972), is titled The differential cross section for chemi-ionization in alkali atom-halogen molecule collisions. Classical interpretation. In the bibliography of the corpus given in appendix B, it denoted as A05. The second article, (Delvigne and Los, 1973), is denoted as A08 and titled Rainbow, Stueckelberg oscillations and rotational coupling on the differential cross section of ${\rm Na + I \to Na^+ + I^-}$. The `tables of contents' of the sections in the original articles and of the modules in the modularised versions are given in Table 5.1a.

These two articles are strongly related. The general problem addressed in the first part of the research project, and in particular in these articles, was the measurement of the cross sections of ion pair formation in molecular collisions and the explanation of the reaction as the first step of a harpoon reaction, using an atom-atom model. Previous to the publication of A05, sufficient insight was gained to conclude that the general explanation was viable and that is was possible to proceed with a more specific analysis. In A05, the authors reported that the experiment and the theory were in qualitative agreement for the differential cross section in reactions between sodium atoms and iodine molecules. This warranted an in-depth study of the reaction between sodium atoms and iodine atoms, which is reported in A08. In the latter case the theoretical model was more applicable than in the case of molecules, but the experiment was far more complicated, owing to the difficulties in creating a stable atomic iodine beam. The article A08 can therefore be seen as the follow-up of A05.


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