Verb + 자마자 (as soon as)

* Grammar: Verb + 자마자 (+ Verb2) (as soon as; right after)
1. Verb ending -자마자: (learnkorean.360korea.com)
* -자마자 is a verb ending that takes the meaning of 'as soon as' or 'right after.' This structure is often used with the word 바로 which means "right after" or "directly." It is often interchangeable with -고 바로  or -서 바로, but -자마자 has a nuance of being a little more urgent and pressing.
Examples:
* 이메일을 보자마자 전화했어요.
* 제가 들어오자마자 비가 내렸어요. (들어오다) (내리다)
* 이 메시지 듣자마다 연락 주세요. (듣다: to hear, listen) Please contact me as soon as u hear this message. (메시지 (n): message)
2. -자마자: (bonewso.net)
This pattern shows a succession of events.
- usually used with action verbs
- the 마자 part is optional
- tense and/or negation occurs in the final/main/independent clause
- this pattern doesn't express a negative surprise like 기가 무섭게
- similar to 는 대로 and 기가 무섭게
Example:
* 일어나자마자, 이를 닦았어요. (일어나다: wake up) As soon as I awoke, I brushed my teeth.
3. Reference more: (koreanwikiproject.com)