Chlorine abundances are reported in 15 evolved giants and one M dwarf in the solar neighborhood .
The Cl abundance was measured using the vibration-rotation 1-0 P8 line of H ^ { 35 } Cl at 3.69851 \mu m. The high resolution L-band spectra were observed using the Phoenix infrared spectrometer on the Kitt Peak Mayall 4m telescope .
The average [ ^ { 35 } Cl/Fe ] abundance in stars with –0.72 < [ Fe/H ] < 0.20 is [ ^ { 35 } Cl/Fe ] = ( –0.10 \pm 0.15 ) dex .
The mean difference between the [ ^ { 35 } Cl/Fe ] ratios measured in our stars and chemical evolution model values is ( 0.16 \pm 0.15 ) dex .
The [ ^ { 35 } Cl/Ca ] ratio has an offset of \sim 0.35 dex above model predictions suggesting chemical evolution models are under producing Cl at the high metallicity range .
Abundances of C , N , O , Si , and Ca were also measured in our spectral region and are consistent with F and G dwarfs .
The Cl versus O abundances from our sample match Cl abundances measured in planetary nebula and \ion H2 regions .
In one star where both H ^ { 35 } Cl and H ^ { 37 } Cl could be measured , a ^ { 35 } Cl/ ^ { 37 } Cl isotope ratio of 2.2 \pm 0.4 was found , consistent with values found in the Galactic ISM and predicted chemical evolution models .