Overview of Infrared Solar Physics.- 1. Infrared Diagnostics of the Solar Atmosphere and Solar Activity.- The Cold Heart of the Solar Chromosphere.- Properties of Faculae from Observations Near the Opacity Minimum.- A Solar Plage Model.- Formation of the Solar 10830 Å Line.- Interpreting Recent Observations of He I 10830 Å.- Variability of the Solar He I 10830 Å Triplet.- Observations of Solar Oscillations in He I 10830 Å.- Observations of Dynamic Events in He I ? 10830.- An Investigation of IR Triplet He I 10830 Å Profiles in Active Regions and the Quiet Chromosphere.- Potential IR Observations of the Solar Corona.- The Sun in Submillimeter Radiation.- Far Infrared and Submillimeter Continuum Observations of Solar Flares: Justifications and Prospects for Ground-Based Experiments.- Submillimeter and Far Infrared Emission from Solar Flares.- Infrared and Submillimeter Diagnostics of Activity and Flares.- The Observed Spectrum of Solar Burst Continuum Emission in the Submillimeter Spectral Range.- Interferometry of Solar Flares at 3-mm Wavelength.- 2. Infrared Observations of the 1991 Total Solar Eclipse.- Eclipse Observations of the Extreme Solar Limb at Submillimeter Wavelengths.- 12-?m Observations at the 1991 Eclipse.- 850 ?m Observations of the 11 July 1991 Total Solar Eclipse.- Observations of the 1991 Eclipse at 3.5 mm Wavelength.- Near IR Observations of the 11 July 1991 Total Solar Eclipse from Mauna Kea, Hawaii.- Infrared Images of the Sun During the July 11, 1991 Solar Eclipse.- IR Observations of the K and F Corona During the 1991 Eclipse.- Infrared Coronal Observations at the 1991 Solar Eclipse.- On the Coronal and Prominence Structures Observed at the Total Solar Eclipse of 11 July 1991.- The White-Light, Far Red (600-700 nm) and Emission Coronae atthe July 11, 1991 Eclipse.- The Structure of the White-Light Corona at the 1991 Eclipse.- 3. Infrared Perspectives on Atmospheric Dynamics.- Subphotospheric Convection.- The Infrared Granulation - Observations.- Simultaneous IR and Visible Light Measurements of the Solar Granulation.- Measurements of Horizontal Flows in 1.6 ?m Granulation.- On Sunspot and Facular Contrast Variations Near 2 ?m and 4 ?m.- Solar 5-minute Oscillations at 2.23 ?m.- Ground-Based Near-Infrared Observations of Global Solar Oscillations.- Solar Oscillations Instrument at an Infrared Wavelength of 1.6 ?m at Yunnan Observatory.- Magnetic Fields, Oscillations, and Heating in the Quiet Sun Temperature Minimum Region from Ultraviolet Observations at 1600 Å.- 4. Infrared Atomic Physics and Line Formation.- Atomic Physics of the 12 ?m and Related Lines.- The Formation of Infrared Rydberg Lines.- Modeling the Infrared Magnesium and Hydrogen Lines from Quiet and Active Solar Regions.- Computation of Infrared Hydrogen Lines.- New Atomic Data for Mg I Lines.- On the Ion Broadening of the 12 ?m lines of Atomic Magnesium.- High-l Rydberg Lines of Fe I in the ATMOS Spectra: 4f-5g, 5g-6h..- High-n Hydrogen Lines in Solar Infrared Spectra from Balloon-borne, Mauna Kea, and ATMOS Observations.- Solar Submillimeter and Millimeter Spectroscopy between 7 and 30 cm-1 from the James Clerk Maxwell Telescope.- 5. Magnetic Fields and Infrared Magnetometry.- Vector Magnetometry Using the 12-?m Emission Lines.- Properties of Magnetic Features from the Analysis of Near-Infrared Spectral Lines.- Theoretical Models of Magnetic Flux Tubes: Structure and Dynamics.- The Thermal and Magnetic Structure of Sunspots.- Infrared Measurements of Stellar Magnetic Fields.- Near Infrared Imaging Magnetometry.- Flux TubeShredding and Its Infrared Signature.- The Structure of Umbral Fluxtubes.- 1.5 ?m Observations and the Depth of Sunspot Penumbrae.- A Magnetic Field Strength vs. Temperature Relation in Sunspots.- The IR Contrast of Magnetic Elements Obtained from High Spatial Resolution Observations at 1.6 ?m.- Diagnostic Tools for Sunspots: the Molecules C2, Mg H and Ti O.- New Infrared Measurements of Magnetic Fields on Cool Stars.- 6. The Infrared Spectrum.- Atomic Spectroscopy in the Infrared.- The ATMOS Solar Atlas.- Synthetic Infrared Spectra.- Line Shifts and Asymmetries in the IR Solar Spectrum.- Solar Abundances of C, N, and O.- Analysis of Very High Excitation Fe I Lines (4f - 5g) in the Solar Infrared Spectrum.- The Sun as a Laboratory Source for IR Molecular Spectroscopy.- 7. Infrared Technology and the Future.- Prospects in Adaptive Optics for Solar Applications.- Solar Optical Interferometry.- The Near-Infrared Capabilities of LEST.- A 4-meter McMath Telescope for the Infrared.- The Applicability of a 5-18 ?m Array Camera to Solar Imaging.- Near-IR Solar Coronal Observations with New-Technology Reflecting Coronagraphs.