Rachel Uchitel -- Getting Divorced

3:47 AM PT: Hahn is asking for custody of their 1-year-old as well as child support and spousal support.

Hahn states in his divorce filing he wants the divorce on grounds of "cruel and inhuman treatment ... such that the conduct of the defendant [Rachel] so endangers the physical or mental well being of the plaintiff as renders it unsafe or improper for the plaintiff to cohabit with the defendant."

Although Hahn is asking for an "equitable distribution of marital assets," it's pretty certain Rachel's settlement with Tiger Woods will remain hers.

Rachel Uchitel is getting divorced after a stormy relationship that blew up last month when she called 911 on her husband ... TMZ has learned.

Sources connected with the couple tell TMZ ... Rachel's husband, Matt Hahn, filed for divorce Monday, citing "cruel and inhumane treatment."

Our sources say ... there were many explosive, verbal arguments. We're also told Matt alleges Rachel slapped him after he repeatedly called her names. FYI, Matt is a former Penn State football player.

As for the 911 call ... we're told Rachel called NYC cops on May 16 after a particularly nasty verbal argument, asking for help in getting Matt out of the house. We're told Rachel did not follow up and did not pursue charges against Matt.

Rachel and Matt were married a year-and-a-half ago. They have a 1-year-old daughter.

Rachel's rep, Howard Bragman, tells TMZ, "It is Ms. Uchitel's goal to resolve this action amicably, quickly and quietly and not in the media."