I'm not convinced that you can use GT simply as an analysis process, if you did not use it as the original basis for your data collection. In particular, GT typically calls for evolution of the research interview as new data becomes available. If you used the same interview guide throughout, then this is what some people have Grounded Theory Lite.
Rokhsareh - yes - of course. As long as you can recruit enough participants to achieve 'theoretical saturation' (as is often sought in Grounded Theory) - then you could use any of the common qualitative non-probability sampling techniques i.e. purposive (judgement), convenience, snow-balling etc - depending on the context of your study topic.
I agree with Dean, with a minor but significant distinction. I do not think that number of participants is a determining factor. The so called *theoretical saturation* can be achieved independently of *enough participants*. We could also have theoretical saturation with *enough data* with *one* participant. What is appropriate depends very much on what the *purpose* is with the research question and research activity.
I'm not convinced that you can use GT simply as an analysis process, if you did not use it as the original basis for your data collection. In particular, GT typically calls for evolution of the research interview as new data becomes available. If you used the same interview guide throughout, then this is what some people have Grounded Theory Lite.
As David Morgan said, GT is not an analytical procedure but a comprehensive methodology. In fact, if you are interested in an analytic procedure you may wish to seek literature concerning the "methodical hermeneutics", "constant comparative method" and "analytic induction" which are in the infrastructure of GT (I attached some below).
That said, I strongly suggest that before you move on you make sure that what you aim at in your study is indeed GT. Too often it is not, but this is not clear to researchers. Most researchers I've encountered eventually find that what they do is no more and no less than thematic analysis. This is not to say that TA is bad, just that it is not enough to count as GT.
No; -- what kind of interviews-- just open -ended? If you have, "...qualitative data obtained from the interviews with a purposive sampling," that yo want to anlayze, check out the excellent text, Qualitative Data Analysis, by Miles and Huberman. Mine is the 2nd editioin and there are newer editions. You will find methods to analyze the data you have already collected.
If your data are already collected then it will be difficult or even very hard to describe the research as grounded theory just as professor Morgan states but if your question is a rhetorical one, and your data is not yet collected then the answer could be yes. But as have been pointed out, grounded theory is not just an analythical tool, it is a methodology including certain ways of recruiting participants, collecting data where previous interview findings are used in the forthcoming interviews and a way of analysing data where besides the interviews also your own memos are used as data togehter with variuos documents concerning the research question like legal rules, documents about routines and so on.
Rokhsareh, GT is a methodology that is intensive and needs you to have designed the research to use that method. Your research question should guide you as new knowledge that has not been extensively researched could indicate the use of GT, of course other indicators are reflected in the Strauss and Corbin(1990) article in addition to what you have been given.Good luck.