1. Could you explain the significance of your article to the non-specialist?

2. What has motivated you to conduct this work?

Most of chemical reactions involve polyatomic species and produce two molecular products. Modern-day's experimental techniques allow one to interrogate the attributes of one of the products, sometimes both products from independent measurements. Yet, the two products are formed in a single reactive event; the coincident information is hitherto unobserved. This article provides such missing information through the product-pair correlation determination.

3. Where do you see this work developing in the future?

The technology is there, the methodology has been developed, and the novelty of this approach is elucidated through the present article. We expect a host of bimolecular reactions can now be studied in this way for deeper insights into chemical reactivity.

4. Are there any particular challenges facing future research in this area?

The new approach provides a powerful means to classify a swarm of reactive events into many pair-correlated trajectories, which potentially enables us to unfold the "unfordable" - the impact parameter averagings in molecular collisions. To achieve that, however, new concepts have to be developed, and more theoretical works need to catch up and are urgently needed.