Spacecraft: Surface Operations Configuration: Science Instruments: SAM

	Sample Analysis at Mars The Sample Analysis at Mars instrument suite will weigh about 83 pounds (38 kilograms) and make up about half the science payload of the Mars Science Laboratory mission. It is a suite of three instruments that will search for carbon-based compounds associated with life. Image credit: NASA/JPL-Caltech Larger Image

The Sample Analysis at Mars instrument suite will take up more than half the science payload on board the Mars Science Laboratory rover and feature chemical equipment found in many scientific laboratories on Earth. Provided by NASA's Goddard Space Flight Center, Sample Analysis at Mars will search for compounds of the element carbon, including methane, that are associated with life and explore ways in which they are generated and destroyed in the martian ecosphere.

Actually a suite of three instruments, including a mass spectrometer, gas chromatograph, and tunable laser spectrometer, Sample Analysis at Mars will also look for and measure the abundances of other light elements, such as hydrogen, oxygen, and nitrogen, associated with life.

The mass spectrometer will separate elements and compounds by mass for identification and measurement. The gas chromatograph will heat soil and rock samples until they vaporize, and will then separate the resulting gases into various components for analysis. The laser spectrometer will measure the abundance of various isotopes of carbon, hydrogen, and oxygen in atmospheric gases such as methane, water vapor, and carbon dioxide. These measurements will be accurate to within 10 parts per thousand.

Because these compounds are essential to life as we know it, their relative abundances will be an essential piece of information for evaluating whether Mars could have supported life in the past or present.