An improved sample chamber 40 for laser assisted spectroscopy integrates valve mechanisms 48, 58 into the sample drawer 46, permitting the sample chamber 40 to automatically bypass, purge and resume flow as the sample drawer 40 is opened 62 and closed 70 to insert samples for processing. Integrating valve mechanisms 48, 58 into the sample drawer 46 in this manner eliminates the need for external valves to be operated to bypass, purge and resume flow, thereby increasing system throughput and reducing system complexity.
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