Wnen I was in graduate school, I worked as a research assistant on a part time basis. Fortunately for me, I was one of the subjects! I was trained to perform various psychiatric symptoms and evaluate the clinicians who assessed me. This was loads of fun!
As a therapist currently, I employ several PRN workers, two are research assistants. Most of the time, the assistants do what is taught for each specific job. Research itself is so structured, but I feel you must also have a balance of abstractness to do a good job in research. Does that make sense? It is also very broad, as are the instructors
Since one of your tutors recommend you contact this person, I would simply write an email that stated, "Ms White asked me to contact you regarding employment as a research assistant." Dependent upon what the researcher's work pertains to, would follow with your interest, such as, "I undersand you are currently researching ....... and I have an interest in this area because ........... then give about three reasons why you are interested. Make these broad and they will apply to you!
Following that, you may want to mention your selling points. " I am pursuing a degree in psychology, a senior?, and consider it a great opportunity to work within the field while still pursuing my degree......"
I am available on a part time basis might be a better fit than available one day per week. Most people who hire you want to know that you are responsible, will be there, and will work while you are there. Everyone wants to hear how you can enahnce the team at work, so if you add a little something about that as well.
I hope this is what you are looking for. Let me know if you have other questions. Gina