The following *keywords* can be used to control an excited-state calculation:

**CIS_CONV**:

specifies the *convergence threshold* (as 10^N with N as the value specified) used in the solution of the CIS eigenvalue problem (default is 5).

**ESTATE_TOL** (to be replaced in the next release by **ESTATE_CONV**):

specifies the *convergence threshold* used in solving the right- and/or left-handside eigenvalue porblem in CC-LR/EOM-CC calculations. The iterative diagonalization is continued until the RMS residual falls below 10^{-N} with N as the value specified with this keyword (default is 5).

**ESTATE_MAXCYC**:

specifies the *maximum number of iterations* used in the solution of the EOM-CC/CC-LR equations
(default is 20).

**ESTATE_PROP**:

needs to be set to **EXPECTATION** in order to obtain *transition moments*. Note that this option is only available for CCSD and that a request for the calculation of transition moments approximately doubles the computational costs. Furthermore, the keyword **ESTATE_PROP** should **not** be used in **analytic gradient calculations**.

Concerning the Zeta equations which need to be solved in EOM-CCSD/CCSD-LR analytic gradient calculations, the same keywords
as for the Lambda equations are to be used, i.e. **LINEQ_TYPE**, **LINEQ_CONV**, and **LINEQ_MAXCYC**.

**EOM_NSTATES**:

for experimental use only. Selects the iterative diagonalization algorithm for the EOMEE calculations.
If set to **DAVIDSON**, the general modified Davidson technique is used. If set to **MULTIROOT**, a multi-root Davidson approach is invoked that evaluates all roots of a symmetry block simultaneously. This approach is much more stable if the roots are energetically close to each other.

**EOM_PROPSTA**:

selects the excited state the EOMEE properties are calculated for. Only valid if **EOM_NSTATES = MULTIROOT** is set. It always refers to the corresponding state of the last symmetry block considered. If not set, the properties are calculated for the last excited state.